Astore owner paid $15 for a book. she marked up the price of the book by 40% to determine its selling price. 18. what is the selling price, in dollars, of the book?

Hello there!

$21 (or 21 dollars)

Step-by-step explanation:

In order to find the total selling price of the book that the store owner priced. There are two ways to solve this, we would need to find out what is 40% of $15, or we can multiply by 1.4.

First way:

In order to find what 40% of $15 is, we would need to multiply 15 by 0.40.

15 × 0.40= 6

Now, we would need to add 6 to the 15 in order to find the price that the store owner would sell it for.

15 + 6 = 21

The selling price of the book would be $21 (or 21 dollars)

Second way:

This is a more quick way with less steps. In this way, we would just multiply 15 by 1.4

15 × 1.4 = 21.

You would still get the same answer, but just in a different way.

Your FINAL answer should be $21

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional