Example 5: The coefficient of x' in the expansion of (2 -- kx)(1 + 5x) is 7700. Find the value of k.

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

Solve for the equation x. 2x + 22 = 4(x + 3)

Which point does not lie on the graph k(x) = 8 -3 √x a. (-64, 12) b. (125, 3) c. (343, 1) d. (8, 5)