Choose the correct simplification of the expression 3 times b all over a to the power of negative 2. 3a2b a to the 2nd power over 3 times b 3 times a to the 2nd power all over b already simplified

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Can someone pls ! pls answer all. no explanation needed..

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.