Mathematics Middle School

Sam will take four science tests this quarter. Her scores on three of the tests are shown below.
What does Sam need to score on the fourth test to ensure that she will have an average of 90% for all four tests?

Answers

Answer 1

Answer:

98%

Step-by-step explanation:

Test 1 - 83%

Test 2 - 91%

Test 3 - 88%

Test 4 - ?

If we use x to represent Test 4, we can create the following equation:

1/4 (83 + 91 + 88 + x) = 90

We find the average here by adding up the four test scores and dividing by 4.

Proceed to solve it:

1/4 (262 + x) = 90

262 + x = 360

x = 98

Therefore, Sam needs to get a 98% to have and average of 90% on all four tests.

Related Questions

Evaluate if x=5 x^2+10

Answers

Answer:

[tex]35[/tex]

Step-by-step explanation:

To evaluate the expression:

[tex]x^2+10[/tex]

First, consider the given information:

[tex]x=5[/tex]

Substitute the given value of [tex]x[/tex] into the expression:

[tex]5^2+10[/tex]

(Note that [tex]5^2[/tex] is the same as [tex]5*5[/tex])

[tex]5*5=25[/tex]

[tex]5^2=25[/tex]

Add:

[tex]25+10=[/tex]

[tex]35[/tex]

-

We can check our work by setting our solution equal to the initial expression:

[tex]x^2+10=35[/tex]

Substitute [tex]x[/tex] for its given value:

[tex]5^2+10=35[/tex]

Simplify [tex]5^2[/tex]:

[tex]25+10=35[/tex]

Add:

[tex]35=35[/tex]

Since both sides of the equation are equal, our solution is correct!

Answer:

35

Step-by-step explanation:

Because X=5, the equation is literally just asking 5x5=10. So, following the order of operations, I would do 5x5 first which equals 25 plus 10. Since 25+10=35.  The answer is 35. Hope this helps! :p

Can you help me get this done by tonight pwitty pweeez... with a chewwy on top

Answers

Answer:

Step-by-step explanation:

try desmos calculator

please help ill give brainliest

Answers

Answer:

-1

Step-by-step explanation:

its -1 because negative * negative is positive. so make the -10 a 10 and subtract 3 and boom you have 7.

Hope this helps ya

Answer:

S= -1

Step-by-step explanation:

Please help me I will give you the brain thing and extra points. (image below) 1/4

Answers

Answer:

B

Step-by-step explanation:

none

PLZ ANSWER I WILL MARK BRAINLIEST

Answers

Answer:

9.6 cm to (t) or 9.6:(t) im pretty shore

and

(t) to 9.6 cm or (t):9.6

Step-by-step explanation:

Answer:

Step-by-step explanation:

an equation for it is When x > 3, (3 - x )2 > 0; we say (3 - x )2 is positive ( + )

What value of k makes this equation true? ANSWER ASSAP



39 = k - 11

Answers

Answer:

50

Step-by-step explanation:

K = 50 will make this right

Please tell me the answers to these 2 questions

Answers

Answer:

they won 5 games

Step-by-step explanation:

4 lost games and 2 more games tied than lost is equal to 6. 6 tied games+4 lost games=10. 15 games total-10 games lost/tied=5 games won.

I answered this on a different one so Here’s the screen shot of the answer mark me the brainiest please

16). The sales tax rate in Jan’s town is 7.5%. If she buys 3 lamps for $23.59 each and
a sofa for $769.99, how much sales tax does she owe?


A. $58.85

B. $63.06

C. $67.26

D. $71.46
Please answer right

Answers

Answer:

B 63.06

Step-by-step explanation:

23.59 x 3 = 70.77

7.5% x 70.77 = 5.31

7.5% x 769.99 = 57.75

57.75 + 5.31 = 63.06

The correct answer is B

6.5 Fish Population

The number of fish in a lake decreased by 25% between last year and this year. Last year
there were 60 fish in the lake. What is the population this year? If you get stuck, consider
drawing a diagram.

Answers

Answer:

if this were to be the fish increasing it would be 240 fishes but its not so the answer is 15

HELPPPPPPP!!!!! chose the one you would use pls

Answers

The answer is A! If 1/3 is gone, there’s 2/3 left. To find how much 2/3 is, you would multiply 80 by 2/3

I don’t like the way my teacher sends out so many questions

Answers

Answers:

14: C.) y = 3.3x +10

15: B.) The table is non-proportional because the x-values do  not increase at a constant interval.

16: ???? I Dunno srry  

Answer:

15. D

Step-by-step explanation:

you have to divide y ÷ x

for example 8.4 ÷ 7 = 1.2

if you continue on with the other rnumbers they all equal 1.2 which means its a proportional table

If one of them was a different answer it would be non-proportional

Find the new amount given the original amount and the percent of change. $5; 40% increase The new amount is $

Answers

Answer:

3

Step-by-step explanation:

5$ -40%=3

If you are asking what is 40% of 5 then your answer is 2

5^3 x 15^20+ 3^9 =

Mates only

Answers

Answer:

4.1565709E25

Step-by-step explanation:

:P

Answer:

thianaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa is beautiful

Step-by-step explanation: ;D

つ ◕_◕ ༽つ              

(ง •_•)ง

(✿◠‿◠)

(✿◕‿◕✿)

(⌐■_■)

The sum of a twice a number, x, and another number, y, is 1. The difference of x and y is -0.25. find X and Y

Answers

Answer: Y= -0.75 X =-.25

Step-by-step explanation:this is because since the difference is -0.25 the X would be .50 but there is a difference

How do 71/100 and 3/10 compare?

Answers

Answer

71/100 > 3/10

Step-by-step explanation:

Answer:

> (greater than)

Step-by-step explanation:

First - FInd the Greatet Common Factor (GCF)

Second - GCF is 100, 71/100

Third - 3x10/10x10 = 30/100

Fourth - Compare numerators, 71 is greater than 30

Greg’s home is 1.8 miles from his school. There is a music store
halfway between school and his home. Today, Greg wants to stop at
the store after school. Right now, he is 0.36 miles away from school.
a. How far is the music store from Greg’s school?
b. How much farther does Greg need to walk to get to the store?
c. How many miles does he have left to walk home?

Answers

Answer: Distance from school to music store: 2.8/2=1.4.

1.4 miles

Step-by-step explanation:

Answers:
a. 0.9 miles
b. 0.54 miles
c. 1.44 miles

Work:
a. 1.8 ÷ 2 = 0.9
b. 0.9 - 0.36 = 0.54
c. 0.54 + 0.9 = 1.44

Josephine is taking a college course, and her professor bases the course grade on the average of 2 tests taken in the semester. She wants to know what she needs to earn on the last test to maintain her grade. Rearrange the following equation for b, where C is the average of 2 test scores, a and b. C=a+b/2
Please DO NOT say that this has already been answered, the answer options were different than this question.
Options:
a.) b = 2C/a
b.) b = 2C + a
c.) b = 2C - a
d.) b = 2C(a)

Answers

It it b that is the answer

The equation C=a+b/2 can be rearranged for b as b=2C - a. Therefore, option C is the correct answer.

We need to rearrange an equation C=a+b/2 for b, where C is the average of 2 test scores, a and b.

What is an average?

By definition, an average is the arithmetic mean of the sum of all the values divided by the total number of values in a given set. An average is calculated for those sets of values which are more or less the same. The term average describes the numeric value that represents a large amount of data. An average can be derived by calculating the ratio of the sum of all the values to the number of units or values.

The equation C=a+b/2 can be rearranged for b as follows:

Now, C=a+b/2

⇒2C=a+b

⇒b=2C - a

The equation C=a+b/2 can be rearranged for b as b=2C - a. Therefore, option C is the correct answer.

To learn more about an equation visit:

https://brainly.com/question/14686792.

#SPJ2

FInd the slope of these graphs plz :(

Answers

Answer:

1. Slope =1.5

2. Slpe=20

Step-by-step explanation:

The first one

150/100=1.5

Second one

1/0.2=20

⚠️(Long Math Question!)⚠️ PLEASE HELP! THIS IS A TEST! "Jack compared the number of pink rose buses to the number of yellow rose bushes as part of a school project. Jack counted 3 pink rose bushes to every 8 yellow rose bushes. Later in the year, there was a drought and many rose bushes died. New rose bushes were planted to make sure there were the same number of rose bushes before the drought. The new ratio of the number of pink rose bushes to the number of yellow rose bushes is 5:6. After planting new yellow rose bushes there were 180 yellow rose bushes. How many pink and yellow rose bushes were there before the drought? Explain your answer using a tape diagram."

Answers

67.5 pink 180 yellow

The ratio at the beginning of the year was 3:8 then it became 5:6 it says that they planted the rose bushes so there would be the same number as before so that means the ratio was 3:8 with 180 yellow rose bushes, to start solving you have to find out how many yellow rose bushes were represented by a 1 in the ratio, to get that divide 180 by 8 to get 22.5, now you know that a 1 in the ratio is equal to 22.5 bushes, multiply 22.5 by 8 to get the total number of yellow bushes and multiply it by 3 to get the total number of pink bushes so then you get (obviously) 180 total yellow rose bushes and 67.5 total pink rose bushes before the drought, you can check that by simplifying the ratio of 67.5:180 which simplifies into 3:8 which means the numbers check out! This took a super long time so please award brainliest or more points if you can.

I need help with this question

Answers

Answer:

the answer is 18

Step-by-step explanation:

18 so sorry I’m late and hope you got this right

Whoever answers first I will give the name the Brainliest.!

900 +$3,400 +) $16,900 + $16,300 + $4,500 + $1,200 =

Answers

Answer:

43,200

Step-by-step explanation:

Which equation is true when the value of x is 3.5?
F. 2 − 8 = 1
G. 3 − 4 = −11.
H. 13 − 2 = 38.5
J .4+ 9 = 23

Answers

G

•••••••••••••••••••••

Answer:

I'll answer it soon brb

Step-by-step explanation:

stop! please help my teachers are very strict and this needs to be turned in in two hour could you help me out?

1. Mr. Colvin drove 1,268 miles in 12 hours. What was his average unit rate of speed in miles per hour? Round to the nearest tenth.

2.True or False: The fraction 3/4 is the same representation as 75%.

3. Put these values in order from least to greatest. 2/3, 80%, 0.25, 1.

;w;

Answers

1) 0.1
2) true
3) 0.25, 2/3, 80%, 1

Write a proportion that could be used to solve for each variable.
Then solve.
18 ounces in 6 bottles
x ounces in 24 bottles
a. 18/6 = x/24; x = 72 c. 6/18 = x/24; x = 8
b. 18/6 = x24; x = 82 d. 18/6 = 24/x; x = 9

Answers

Answer:

b

Step-by-step explanation:

the answer b..... 82

HAPPY EARLY CHRISTMAS !!!
hope y’all asked for something good and ur gonna get it! FREE 50 POINTS! IM vERY NIcE

Answers

Answer:

its not christmas anymore but ty

Step-by-step explanation:

Answer:

:D

Step-by-step explanation:

Can someone help me with this? Its math :/

Answers

1. put a point on -2, the go up and down 4/1 , put a point on 3, and go up and down 1/1
2. put a point on 3 and go up and down 2/1,
subtract 4x and add it to the other side, then you get 2y= -4x -8, divide by 2, and you get y= -2x - 4, plot a point on -4, and go up and down 2/1
hope this helps, feel free to mark brainliest
This is a y=mx+b problem
This is how you would graph it
| The answer for the first one would be
V ( 1,2)

Karen took a loan out for $18,000 for a used car with an annual interest

rate of 5.75%. If she plans to have the loan for 60 months, how much will

she have to pay back to the loan company?

Answers

Answer: 23,175

Step-by-step explanation: If she took a loan of 18,000 you add it with 5,175 because that is the interest rate. And you get 23,175. Hope this helped :)

Ashley is diving in the ocean. She wants to reach a coral reef that is 60 feet below sea level; that is, the reef’s elevation is -60 feet. She decides to safely descend to the reef from the ocean’s surface in increments of 10 feet. Answer the following questions to learn more about Ashley’s rate of descent.

Ashley dives in increments of 10 feet. What rational number represents diving 10 feet below sea level?

Answers

Answer:

I am not positive that this is correct

Step-by-step explanation:

So if she want to reach a reef that has a elevation of -60 and she descends at a rate of 10 feet my guess the rational number that would represent this problem would be

-60/10

Answer:

-10 or -10 feet

Step-by-step explanation:

i need help with this quick

Answers

2/3 because
x=4x-2
-3x=-2
x=3/2
so Karen has x coins....
Kevin must have 3x-2 ......so these are the two eqns

can you please help me? I'm stuck.

Answers

Answer:

B

Step-by-step explanation:

hi! thats ok! so for zero slope, graph any horizontal line. then for positive slope, graph a line going from the bottom left to the top right. lastly for negative slope, graph a line going from the top left to the bottom right. hope this helps! :)
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