Answer:
. (a) A scientist is doing an experiment on bacteria. She finds that the number ofbacteria in a test tube increase at a rate of 0.9% per hour.At 12 noon there are 4500 bacteria.At 3 pm, how many bacteria will be present? Give your answer to 3 significantfigures.
12pm 4500 bacteria1pm 4500 x 1.009 bacteria 2pm 4500 x 1.009 x 1.009 bacteria3pm 4500 x 1.009 x 1.009 x 1.009 bacteriaTherefore at 3pm there are 4620 bacteria present.
Answer: 4620 (3)(b) In another experiment with the same bacteria, the scientist counts 3000 bacteria.How many bacteria were there two hours prior to this measurement?Give your answer to 3 significant figures.
Now 3000 bacteria1 hour ago 3000 ÷ 1.009 bacteria 2 hours ago 3000 ÷ 1.009 ÷ 1.009 bacteriaTherefore 2 hours ago there were 2950 bacteria present
Answer: 2950
Step-by-step explanation:
if there are only 2 of a particular stamp remaining out of 5000 originally printed, what percent remains today?
A rectangular prism has a length of 5 cm, a width of 7 cm, and a height of 4 cm. What is the volume of the prism?
Answer:
140
Step-by-step explanation:
V=whl=7·4·5=140cm³
Answer:
140cm^3
Step-by-step explanation:
It is 140 because volume is base x length x height so 7 x 5 x 4 = 35 x 4 = 140 cm cubed so 140cm^3
Hope this helps
solve for the missing side
Answer: 8
Step-by-step explanation: you have to cross multiply 6 and 4 to get 24. 24/3 is 8
Hope this helps
5. Your students have been working on algebra equations involving inequalities. The
rule for learning the > sign is:
ОООО
A) the arrow has nothing to do with numbers.
B) the arrow always points to the largest side.
the arrow always points to the smallest side
D) the opening of the arrow is always on the smallest side.
Answer:
C) the arrow always points to the smaller side
Step-by-step explanation:
if you struggle to remember think of it as a crocodile going for the highest amount of 'food', in this case the food is the number
Answer: C, the arrow always points to the smallest side.
Step-by-step explanation:
A way of remembering which way the '>' sign goes is to think of it as a crocodile mouth (the open bit) and the crocodile wants the most food (the biggest number).
Sandra saves 12% of her salary for retirement. This year her salary was $3,000 more than in the previous year, and she saved $4,200. What was her salary in the previous year?write an equatio____.sandre's salary in the previous year was___
Answer:
44
Step-by-step explanation:
PLS HELP AND ANSWER QUICK
Answer:
ACB=44°
DCE=35°
BCD=101°
Step-by-step explanation:
ACB is a triangle and all triangles are 180 degrees
78+58=136
180-136=44
DCE is also a triangle
85+60=145
180-145=35
a straight line is 180 degrees, we already know what the other two is.
35+44=79
180-79=101
Need help please ASAP.
The school has 6 rows of lockers. Each row has 35 lockers. For the first 5 rows, all of locker are taken. For the last row, 3/5 of the locker are taken , 3/4 of all locker that are taken have decorated name tag. How many locker at school have decorated name tags.
a) 145
b) 141
c) 143
d) 147
The number of locker at school have decorated name tags is 147. Therefore, option D is the correct answer.
What is the unitary method?The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
Given that, the school has 6 rows of lockers. Each row has 35 lockers.
For the first 5 rows, all of locker are taken.
Number of lockers in 5 rows are 35×5=175
For the last row, 3/5 of the locker are taken is
3/5 ×35 =21
So, the total number of lockers taken = 175+21
= 196
3/4 of all locker that are taken have decorated name tag
Now, 3/4 ×196
= 3×49
= 147
Therefore, option D is the correct answer.
To learn more about the unitary method visit:
brainly.com/question/22056199.
#SPJ1
FREE BRAINLIEST IF RIGHT
Answer:
D is the only one that matches up if I remeber how to do this correctly
Answer:
Yes it is d I agree with him
Step-by-step explanation:
Gabrielle spends $12 of her weekly allowance on lunch. If this amount is 60% of her weekly allowance, what is her total weekly allowance? Use a proportion to solve.
Answer:
don't type that link it's a scam dawg
you are correctyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
Answer:
yayyy
Step-by-step explanation:
Answer:
Aww Thanks :)
Step-by-step explanation:
pls helpppp with explanation pss
Step-by-step explanation:
27 cubes are needed because you could need a 3×3 ×3 cube
(this is a practice question)
Answer:
<GHI = 135 degrees
Step-by-step explanation:
(3x + 12) + (x + 4) = 180
4x + 16 = 180
4x + 16 - 16 = 4x
180 - 16 = 164
4x = 164
4x / 4 = x
164 / 4 = 41
x = 41
3 * 41 + 12
3 * 41 = 123
123 + 12 = 135
please help me with this math project (photo linked). (7th grade unit 3) check my other questions plsss (last one)
1. -3x - 17
2. -24x + 25
3. 2x + 4
4. -9x -9
5. 7x - 2
Given sin^2 x = (1 - cos(2x))/2 Prove: sin(x/2) = plus/minus sqrt((1 - cos(x))/2) Prove Complete the steps of the proof
Answer:
1. half angle
2. x
Step-by-step explanation:
The missing parts of the proof is the variable x.
What are Trigonometric Functions?Trigonometric functions are those functions which are the ratio of the sides of a right angled triangle.
Given,
sin² (x) = [1 - cos (2x)] / 2
We have to prove sin ([tex]\frac{x}{2}[/tex]) = ± [tex]\sqrt{\frac{1-cos (x)}{2} }[/tex]
First, we have
sin² (x) = [1 - cos (2x)] / 2
Substituting x/2 in place of x, we get,
sin² (x/2) = [1 - cos (2x/2)] / 2
sin² (x/2) = [1 - cos (x)] / 2
sin² ([tex]\frac{x}{2}[/tex]) = [tex]{\frac{1-cos (x)}{2} }[/tex]
Taking square root on both sides,
sin ([tex]\frac{x}{2}[/tex]) = ± [tex]\sqrt{\frac{1-cos (x)}{2} }[/tex]
Hence it is proved.
Learn more about Trigonometric Functions here :
https://brainly.com/question/6904750
#SPJ2
find each angle measure.( Diagrams are not drawn to scale)
Solve the following proportion for
y
y
4
=
11
17
Round your answer to the nearest tenth.
please helppp
A test is 45 minutes long. There are 3 sections of the test that each take an equal amount of time. How many minutes m is each section of the test? Write an equation to represent the number of minutes for each section.
Please help me
Answer:
15
Step-by-step explanation:
Answer:
each section takes 15 minutes long
Step-by-step explanation:
An equation you can use to get this is 45 ÷ 3 = x
x = 15
so the answer to the equation would be 45 ÷ 3 = 15
If another sample of size 100 is taken, what is the probability that its sample mean will
be greater than 2.56 in?
Answer:
I don't know the answer to this but
Suppose we draw a sample of size n=16 from this population and want to know how likely we are to see a sample average greater than 22, that is P( > 22)? So the probability that the sample mean will be >22 is the probability that Z is > 1.6 We use the Z table to determine this: P( > 22) = P(Z > 1.6) = 0.0548.
Step-by-step explanation:
Real answer not a scam
Answer:
Area = 240 cm²
Step-by-step explanation:
Area of the shape = area of rectangle + area of triangle
= L*W + ½*bh
L = 18 m
W = 10 m
b = 10 m
h = 30 - 18 = 12 m
Plug in the values
Area of the shape = 18*10 + ½*10*12
= 180 + 60
= 240 cm²
Five less than 10 times a number is -13.
Answer:
10 x X - 5 = -13
Answer:
Step-by-step explanation:
10x-5= -13
10x= -13+5
10x= -8
x= 10/-8
x= -1.25 or 5/-4
Need the answer ASAP
Answer:
63
Step-by-step explanation:
To find the area of a trapezoid you have to use the formula
a+b/2 h
So we would substitute them
3 + 15 / 2 x 7
Which would equal
63
Hope this helps :)
Tarzan is making his mom a card for her birthday. He drew a model of the card before he created it. The model is shown below.
The front of the card is shown. If Tarzan covers the whole front side of the actual card with decorative paper, how much paper would he need? you may use exact answers or round to the nearest hundredth.
Answer:
The area of a triangle uses the equation:
A = ab/2
a = 12
b = 9
A = 12 * 9 / 2
A = 54 inches
54 / 3 = 18
He needs 18 feet of paper
POSSIBLE POINTS. 1
On the written portion of her driving test, Leslie answered 65% of the questions correctly. If Leslie answered 78 questions correctly, how many questions were on
the driving test?
What part is missing?
O percent
a
ASAP!!!
Answer:
Step-by-step explanation:
I need help with these QUESTIONS ANYONE ?????!!!!!
What is 7-4/6 ?
What is 234-303+93847?
Answer:
7-4/6 = 6.33333333333
234-303+93847 = 93778
Step-by-step explanation:
A person earns $23 comma 600
one year and gets a 5% raise in salary. What is the new salary?
Answer:
la respuesta que buscas es bastante simple pero no lo sé
Step-by-step explanation:
I need help :( on math and I forgot to study!:
When is the additive relationship used? Select all that apply.
1.When subtracting the same amount to an x-value.
2.When dividing the same amount to an x-value.
3.When multiplying the same amount to an x-value.
4.When adding the same amount to an x-value.
Answer:
3 and 4
Step-by-step explanation:
Answer:
1st and last one just did the question and it was right
Can someone help me and not be a troll.... I’ll reward points + brainalist
Answer:
The answer is 69.5
Step-by-step explanation:
First u wanna find the area of the rectangle and since it already gives you the the height and width you want to multiply them together 13×4= 52
meanwhile triangle is 5ft tall and the base is 7ft
using the formula to solve for area of a triangle you would multiply height and base and divide by 2
you should end up with 17.5 then u add that to 52 and get 69.5 ♡ Hope this helps.
HELP!!!!!!!!!!! !!!!!!!!!!
Answer:
second one is 3, the last one is 4560
Step-by-step explanation:
What is |-8/?
1-16
-8
8
16