What is the next term in the following constant velocity sequence? 10cm, 17cm, 24cm, a.32cm b.35cm c.31cm d.20cm e.28cm

Let
a1=10 cm
a2=17 cm
a3=24 cm
a4=?

we know that
a2-a1=17-10> 7 cm
a3-a2=24-17> 7 cm
a(n)=a1+(n-1)*7

find a4
for n=4
a(4)=a1+(4-1)*7> a(4)=10+3*7> a(4)=31 cm

the answer is
31 cm

This polygon has 4 sides
180(4-2) = 180(2) = 360 degree
80+90+2x + 3x = 360
170+5x = 360
5x = 190
x= 38
measure of angle t is 2(38)= 76
the answer is c. trust me
hope this !