Question

from unit 5, lesson 11
in each equation, the ? represents an operation. which operation makes each equation true?
a. $48?(-8)=(-6)$
b. $(-40)?8=(-5)$
c. $12?(-2)=14$
d. $18?(-12)=6$
e. $18?(-20)=-2$
f. $22?(-0.5)=-11$

Explanation:

Part a

Step1: Test division

We know that \(48\div(-8)= -6\). So the operation is division.

Step1: Test division

We calculate \((-40)\div8=-5\). So the operation is division.

Step1: Test subtraction (or addition of positive and negative)

We check \(12-(-2)=12 + 2=14\). So the operation is subtraction (or addition of the opposite, but in terms of the operation symbol, it's subtraction: \(12-(-2)\))

Answer:

Division (÷)

Part b