Answer:
x7-3 as number is multiplied by 7 then subtracted by 3
X=30
Put in proportions x/45 = 18/27.
Cross multiply and get 27x= 45 x 18
Or 27X = 810.
Next, divide by 27 on both sides to get X=30.
Answer:
To do this, you wold need to know the percent error formula.
Percent Error = (Actual value - Expected Value)/Expected Value x 100
Percent Error = (388 - 400)/400 x 100
P.E = (-12)/400 x 100
-0.03 x 100
-3%
(It could possibly positive, if they don't take negative)
Hope this helps!
