Greg is going for a walk. he walks at a speed of 3 miles per hour for 7.5 miles. for how many hours does he walk?

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

Which equation represents h for right triangle abc

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25