Question

signed numbers pls help !1) 15-(-2) a) -15+2 b) 15-2 c) 15+22) -18+(-4) a) -18-4 b) -18+4 c) 18-43) -7-(-12) a) -7 - 12 b) -7+12 c) 7+124) -8 - (+15) a) -8+15 b) 8-15 c) -8 -155) 9+(-16) a) 9-16 b) 9+16 c) -9+16

Answer 1

Given:

Signed numbers consist of negative numbers and positive numbers.

Rules of multiplication in signed numbers.

If the signs are the same the result is positive. If the signs are different the result is negative.

This means;

`\begin{gathered} -*-=+ \\ +*+=+ \\ \\ -*+=- \\ +*-=- \end{gathered}`

To solve these questions, we expand the brackets by multiplying the signs together using the rule of multiplying signed numbers.

Question 1:

`\begin{gathered} 15-(-2)=15-*-2 \\ =15+2 \end{gathered}`

Therefore, the correct answer is OPTION C.

Question 2:

`\begin{gathered} -18+(-4)=-18+*-4 \\ =-18-4 \end{gathered}`

Therefore, the correct answer is OPTION A.

Question 3:

`\begin{gathered} -7-(-12)=-7-*-12 \\ =-7+12 \end{gathered}`

Therefore, the correct answer is OPTION B.

Question 4:

`\begin{gathered} -8-(+15)=-8-*+15 \\ =-8-15 \end{gathered}`

Therefore, the correct answer is OPTION C.

Question 5:

`\begin{gathered} 9+(-16)=9+*-16 \\ =9-16 \end{gathered}`

Therefore, the correct answer is OPTION A.