Question

Please help, medal will be given!

When –3 is multiplied by the sum of a number and 8, the result is –21. Find the number.
A. 3
B. –1
C. 8
D. –2

Answer 1

@triciaal

Answer 2

let the number = n
-3*(n + 8) = -21
do you see this?

Answer 3

Oh yes, I see

Answer 4

now use the distributive property to get rid of parenthesis watch your signs
next do what is necessary to leave the term with n on one side of the equation
to keep the balance of the eqn whatever you had to do to leave "n" on one side do to the other side

Answer 5

you want the coefficient of n to be 1 so you divide by the number in front of n to get n and you also divide the other side to keep the balance

Answer 6

I don't know I'm getting different answers when I try to solve with calculator..
Can you help me with question instead?

One dimension of a rectangular map is 8 inches and the perimeter is 40 inches. What is the other dimension of the map?
A.
14 inches
B.
12 inches
C.
4 inches
D.
2 inches

Answer 7

so did you get n = -1?

Answer 8

Well when I plugged it in, I got -16.. But maybe I did it wrong

Answer 9

let's back up at show your work following the directions
start at using the distributive property to get rid of ( )

Answer 10

typo and show your work

Answer 11

how do you get rid of the parenthesis?

Answer 12

do you need my help or not?