Which expression has the same value as the one below?

8 + [4 + (–9)]

a. 12 + (–9)
b. –12 + 9
c. –4 + (–9)
d. 4 + (–9)

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Bring the fraction a/a-4 to a denominator of 16-a^2

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)