On a test with 25 problems, grace got 88% correct. how many problems did grace get right?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

Ineed with math stuff it involves graphs

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244