Which of these numbers are less than 8.1 × 10^-8? a)8.2 × 10^-8 b)7.3 × 10^-5 c)9.2 × 10^-9 d)3.4 × 10^-10

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?