Rj plumbing and heating charges 55$ plus 40$ per hour for an emergency services gary remembers being billed over 150 for emergency services. how long was rj there ?

Acar with a mass of 600 kg is traveling at a velocity of 10m/s. how much kinetic energy does it have?

Can somebody me out with this question

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).