I need help with all of them but 13B you can answer all of them some of them or just one of them make sure to verify which one you are solving please and thank you

13. 14. 15.

A.) 21 A.)-2 A.) 8

B.) 21 B.) 14 B.) 8

Step-by-step explanation:

13.

A.) 2(4)^2 - 11 = 21. B.) 2(-4)^2 - 11 = 21

* Note: if the power is a even number (2, 4, 6, and on), then the negative won't affect the answer and can be forgotten.

14.

A.)2squareroot16 - 10 = -2.

B.)2squareroot16 - 10 = 14

15.

|-3 - 8| + (-3) =8

|1/2 - 8| + 1/2 = 8

answer: the value of x is 7cm

step-by-step explanation:

10/60

step-by-step explanation:

if you divide 10 by 60 the answer is 0.166666 while if you divide or solve the other problems it equals 0.6