Find the solution to each equation mentally or use your calculator. (Hint: do the opposite of the number on the left side of the equation) .

A: 30+a=40

B: 500+b=200

C: −1+c=−2

D: d+3,567=0

PLEASE ANSWER EACH ONE IM HAVING TROUBLE PLSSS HELP :( IM GONNA FAIL

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

9/10 divide by -3/15 as a mixed number

Solving algebraic equations 2m+3=11