# Posts by Trev

Total # Posts: 7

Math
william had 30 dollars. he spent one third on a book and save the rest. how much was the book and how much did he save

Physics
A) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (≈65mph)? B) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?

statistics
The Intelligence Quotient (IQ) test scores for adults are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability we could select a sample of 50 adults and find the mean of this sample is between 95 and 105?

Math
A children's game has a spinner that is equally likely to land on any 1 of 4 colors: red, blue, yellow, or green. Determine the probability of spinning a red both times on 2 spins. Explain your reasoning.

pre alg
(-4)cubed divided by (-2)cubed -3(-5)squared I got -67 am i correct?

Physics
A string has a mass per unit length of 7.00x10-3 kg/m and a length of 0.230 m. What must be the tension in the string if its second harmonic has the same frequency as the second resonance mode of a 2.05 m long pipe open at one end?

physics
if the volume of a penny is 0.423cm cubed , how deep would a 30ft diameter swimming pool have to be to hold one billion pennies? One billion * volume penny=volumeswimming pool but volumeswimming pool is equal to height*area so calculate height