Is 5 a solution to the equation 2x2 + 10 = 60?

Yes.

Step-by-step explanation:

Solution:

As per the problem given equation is,

(//substituting all at left)

So the value of x can be 5 and -5.

Hence one value of x can be 5 (proved).

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