What are the correct steps for solving the equation x^2-2x-15=0

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz

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

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify