Tommy used benchmark fractions to estimate the sum of 1/5 + 3/7 as 1. Tommy's teacher said he was incorrect. Explain what error Tommy might have made and what tips you can give him to solve the problem correctly.

21.4 i did it already for s1

step-by-step explanation:

hreryryrranswer:

step-by-step explanation:

answer would be 8.64 or s = 11π/4 inches

step-by-step explanation:

s = r θ  

where s = arc length  

r = radius = 3 inches  

θ = central angle in radians = ( π /180)*165  

s = 3(π/180)*165  

= 8.64 inches

d. you cannot tell because there are no values shown.