A box of 15 cookies cost $9 , what is the cost for 1 cookie

0.60 cents.

Step-by-step explanation:

If you have 15 cookies that costs $9, you need to divide 9 by 15. This will give you 0.6 cents, or 60 cents. If you multiply 0.6 x 15 cookies, you will get $9. This is the best I can explain it.

(I hope this helped).

you divide the cost ($15) by the quantity (6) to get your questions answer. the yo-yo costs $2.50. hope this : )!

step-by-step explanation:

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.