Question

I am giving exam help me​

Answer 1

Answer:

11. 170cm

12. 5

13. 11

please mark me as the brainliest.........

Answer 2

Answer:

11) 170cm

12) 5

13) 11

Step-by-step explanation:

(11) mean = (175+158+180+164+182+160+171) ÷ 7

mean = 1190 ÷ 7 = 170cm

(12) (2n+5) =3(3n-10)

=> 2n + 5 = 9n - 30

=> 9n-2n = 30+5

=> 7n = 35

=> n = 5

(13) let number be x

=> 9 + 2x = 31

=> 2x = 31-9 = 22

=> x = 22/2

=> x= 11