Jessica buys a book on sale. she writes the expression 0.7b to show the percent of the original cost of the book, b, that she pays. she rewrites the expressions as b - 0.3b. which statement explains why jessica rewrites the expression? .
a. she receives another discounts on the book.
b. she buys another book with different discount.
c. she wants to show by what percent the book was discount.
d. she wants to show what percent of the original price he paid.

C. She wants to show by what percent the book was discount.

Step-by-step explanation:

We are given that,

The expression showing the percent of the original cost =

Re-writing the expression, we have,

The expression showing the percent of the original cost = =

So, we get the total price 'b' is reduced by 30%.

Thus, the expression shows the discount she received on the book is 30%.

Hence, Jessica re-writes the expression to show the percent by which the book was discounted.

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm