Question

5 poin
7. If AM of a, a+3, a+6, a+9 and a+12 is 10, then a is equal to;
(a)1
(b)2
(c)3
(d)4​

Answer 1

Answer:A+a+3+a+6+a+9+a+12=10

5a+30=10

5a=10-30

5a=-20

a=-20/5

a=-4