Jerry started doing sit-ups every day. the first day he did 13 sit-ups. every day after that he did 2 more sit-ups than he had done the previous day. today jerry did 29 sit-ups. write an equation that could be solved to find the number of days jerry has been doing sit-ups, not counting the first day. let  n  represent the number of days.

an equation that can jerry to find the number of days he has been doing sit-ups is given by

An equation that can help Jerry to find the number of days he has been doing sit-ups is  

Step-by-step explanation:

First day = 13

Second day =  first day + 2 = 13 +2 =15

Third day  =  second day + 2 =  17

Fourth day = Third day +2  = 19

So,

13 , 15 , 17, 19, 21, 23 ...........

The common difference is 2

By using arithmetic series

where

is the number of sit-ups done on the nth day

n is  number of the days

d is the difference

Now

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.