Question

Becky tried to evaluate an expreisson step by step

4/5 + 7 - 5/4
4/5 - 5/4 + 7 step 1
0+7 step 2
7 step 3

find becky mistake
a.step 1
b.step 2
c.step 3
d.becky did not make a mistake

Answer 1

step 2

Explanation:

1) so in step 2 Becky make 4/5-5/4=0

this is wrong, as we have to make common denominators first:

16/20-25/20=-9/20

so now, we got -9/20

-9/20+7=

2) make common denominators again

-9/20+140/20=131/20

this is the right answer Hope this helps!