please help its due at 2:40

A photon of visible light can be emitted whenSelect one:O a. an excited electron jumps down to ground stateO b. a ground state electron absorbs energyO c. a ground state electron jumps to a higher energy level 30% of the scholars are working as stagehands. 35 scholars are actors and actresses. How many students in total are in the school play, acting and working behind the scene? How is replication of an experiment important in a scientific investigation? Which statement is true about the particles of a liquid when the liquid changes into a solid?They move closer to each other.Their kinetic energy increases.They stop vibrating.The attractive force between them decreases. PLS HELPP!In the diagram, PQ RS, and transversal tintersects both lines.Select all the true statements.1 4because they are vertical angles1 8because they are alternate exterior angles1 5because they are corresponding angles1 3because they are alternate interior angles Somebody help me out real fast guys i need help with this math question anyone help plzz??? If a=5 and b=-3, what is the value of 2ab-b2?A. -262B.-259C.-39D.-21 plz help no explenation needed 67 people are running a race. How many different ways can there be a 1st, 2nd, and 3rd place winner? Please answer correctly! I will mark you as Brainliest! Some people think that it is irresponsible to do dangerous or risky activities. Other people thinkthat these activities are exciting and great experiences to have. What do you think? Write an essay giving your opinion. You could include some of the following: examples of risky activities what can go wrong how people benefit from them Your marketing team has conducted two focus group sessions to evaluate a new product design. The first focus group consisted of teenagers and resulted in four out of five liking the new product. The second group was made up of parents of young children. Only one out of five people in this group said they liked the same new product as the teens. With 90% confidence (Z = 1.64), can you say that there is a difference between the views of these two populations? Please show your calculations, use 2 decimal places in your calculation answer, and justify your answer regarding differences. Shaylee is determining if 6 is the solution to the equation. Platinum Services provides outsourced employee benefits administration services to several private and public sector companies. It is now planning to attract new business by introducing a premium service for high revenue companies (with year-end revenues of $2 billion or more) and wants to undertake a survey of companies sampled from the New York Stock Exchange, which lists public sector companies, in order to estimate the popularity of such a proposal. Required:What best describes the sampling frame? Uh please help me, I need a step by step answer. I NEED HELP ASAP ILL MARK AS BRAINLIEST IF CORRECT! Calculate the Standard Enthalpy of the reaction below:NH3(g) + HCl (g) NH4Cl(s)Using the following Enthalpy of Reactions:2HCl(g) H2(g) + Cl2(g)AH = +184.6 kJ2H2(g) + 12 N2(g) + 2 Cl2(g) NH4Cl(s) AH = -314.4 kJN2(g) + 3 H2(g) 2 NH3(g)AH = +184.6 kJ Helppppppp plsssssssssssssssssssssss What is the density of a 60-gram pyramid with rectangular base 5 cm x 7 cm and height 9 cm?