Answer:
Sarah is incorrect.
Step-by-step explanation:
By plugging 10 in as 'x' to the equation, we get y=21+(2*10). 2 x 10 is 20, and 20 + 21 is <em>not</em> 42 - it's 41. So, Sarah is incorrect.
7.5 = 8
Step 1:
30/100=0.3
Step 2:
0.3 x 25 = 7.5
Round: 8