Im thinking C . <span>extra amount added to the marginal cost to arrive at the selling price because you're marking up the price because its </span>more for you and if it was cheaper you'd lose money.
Answer:
Helen requires 15$ more to buy the three books.
Step-by-step explanation:
We are given the following in the question:
Cost of dictionary = $7
Cost of dinosaur book = $16
Cost of cook book = $17
Helen's allowance = $25
Total cost of three books =

Extra money required to buy three books =

Thus, Helen requires 15$ more to buy the three books.
Altho' 2 is a factor of both 8 and 64, we cannot "find the value of 2" because that's already given.
I believe you may have meant "<span>Find the value of z in the following equation: 8z=64".
We can solve that equation for z: z = 64/8, or z = 8 (answer).</span>