What is the simplified form of this expression?
(-3x2 + 2x - 4) + (4x² + 5x + 9)

4x²+7x+3

Step-by-step explanation:

4x² is by itself

5x+2x=7x

-3*2=    -6       -6+9=3

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40