Simplify the expression -4^2(3x - 7)

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

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

What is the mean of the data set 125, 141, 213, 155, 281