Point S Is the midpoint of segment TU ST=8+3x and TU = 100 find x

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

The focus of a parabola is (-4,-5) and its directrix is y=-1 find the equation

Acoin is tossed 4 times which of the following represents the probability of the coin landing on heads all 4 times