Question

1. compute each of the following (without a calculator (a) 15 + 3 - (-10) = (b) -27 + 16 + (-9) =

Explanation:

Step1: Simplify the double negative

$15 + 3 - (-10) = 15 + 3 + 10$

Step2: Add the leftmost numbers first

$15 + 3 = 18$

Step3: Add the remaining values

$18 + 10 = 28$

Step1: Rewrite the addition of a negative

$-27 + 16 + (-9) = -27 + 16 - 9$

Step2: Add the first two numbers

$-27 + 16 = -11$

Step3: Subtract the final value

$-11 - 9 = -20$

Answer:

(a) $28$
(b) $-20$