Respuesta :

hlv8

Answer:

Yes

Step-by-step explanation:

90/2 = 45

126/2.8 = 45

Therefore these rates do form a proportion

icerina006

Step-by-step explanation:

so we will find the number of sit-ups the friend should do, if it is a direct proportion

let the number of friend's sit-ups be x

2   : 2.8

90 : x

cross multiply

we get x=126 sit-ups

so the rates do form a (direct) proportion