Write an equation and solve. 21 is 35% of what number? a. x = 21 · 0.35; 7.4 b. 0.35 = 21 · x; 40.8 c. 21 = 0.35 · x; 60 d. 21 = 0.35 · x; 62.4

35% = 0.35

21 = 0.35 * x

so x = 21 / 0.35

x = 60

answer

C. 21 = 0.35 · x; 60

what are the statements

step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.