Combine like terms.

(-3y2 - 7y - 9) - (4y2 + 6y + 9)

a. y2 - y

b. -9y2 - 11y - 18

c. 7y2 + 13y + 18

d. -7y2 - 13y - 18

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Write each fraction as an equivalent fraction with a denominator of 120then write the original fractions in order from samllest to largest

Which equation is true? i. 56 ÷ 4·7 = 82 ÷ (11 + 5) ii. (24 ÷ 8 + 2)3 = (42 + 9)2 neither i nor ii ii only i and ii i only