Ans
Step-by-step explanation:
Answer: (D) 1.99x + 1.89y = 9.57
Step-by-step explanation: The reason is because equation option D states that for every notepad and pencil, x and y he bought, the total of his bill would equal $9.57.
Answer:

Step-by-step explanation:
Answer:
dC = 2.44
Relative error = 19%
Step-by-step explanation:

Δv = 3 ; ΔT = 1 , v = 23, T = 8
Use differential Calculus


Relative Error
dC / C @(T = 8, v=23) * 100 = 19 %