The percentage error is 23%
Explanation:
The estimated total cost of the groceries = $50
The actual cost of the groceries = $65
To find the error value, we need to subtract the value of actual cost and total cost of the groceries.
Thus,
error value = actual cost - total cost
error value 
Hence, error value = $15
The formula to determine the percent error is given by

Substituting the values in the formula, we get,

Rounding off the value, we have, 23%
Thus, the percentage error is 23%
Answer:
9) Choice D 10) 7.368 x 10^6
Step-by-step explanation:
9) 299,792,458
D=300,000,000 = 3.0 x 10^8
10)
(7.4 x 10^6) - (3.2 x 10^4)
7400000 - 32000 = 7,368,000 = 7.368 x 10^6
Y=-9x+10 is the equation solved for y.