The table shows the ratio between the number of books ordered and their cost:

Mathematics

2 answers:

Mrrafil [7]3 years ago

7 0

7 books costs $14, etc. We have points in a line

(7,14)

(8,16)

(9,18)

They're all points on the line y=2x which just means it costs $2 a book. So 1 book costs $2, 2 cost $4, and 3 cost $6. We have three new points:

(1,2)

(2,4)

(3,6)

They're all on the same line, y=2x, just closer to the origin than the first three. We plot a point at x=1, y=2, etc.

Merry Christmas

Ahat [919]3 years ago

6 0

Answer:

Number of books Cost (dollars)

1 2

2 4

3 6

_____________________________________

(1,2)

Start from the origin and move 1 unit to the right and 2 units up.

(2,4)

Start from the origin and move 2 units to the right and 4 units up.

(3,6)

Start from the origin and move 3 units to the right and 6 units up.

Step-by-step explanation:

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Ann cleans an apartment in 12 hours and liz cleans an apportment in 18 hours. How long would it take to clean an appartment toge

Tresset [83]

If Ann cleans in 12 hours then she cleans $\frac{1}{12}$ of the apartment per hour. Similarly Liz cleans $\frac{1}{18}$ of the appartment per hour. So together then can clean $\frac{1}{12}+\frac{1}{18}=\frac{5}{36}$ of the apartment for hour. Therefor it will take them $\frac{36}{5}=7.2$ hours to clean.

The general formula $R_{c}=\frac{AB}{A+B}$ can be used as a check if needed.