Question

If the cost of books is $30, then the number of books is ________.

- 10
- 12
- 20
- 40

Hint:

### The defining property of a linear function graph is that it has a constant rate of change.

## The correct answer is: 10

### Here number of books : cost of books = 2:6 = 1:3

This means, that 3$ is the cost of 1book.

3 10 = 30$ is the cost of 1 10 = 10books

Thus ,10 books cost 30$.

### Related Questions to study

Determine the ratio of number of books to the cost

Determine the ratio of number of books to the cost

The quantities compared in the graph are _____________

The quantities compared in the graph are _____________

### Lara completed 105 sit-ups in 3 minutes. She can 420 sit-ups at the same rate in ____________ minutes.

We can find the time required to 420 sit ups by multiplying the time required to 105 sit ups by 4.

### Lara completed 105 sit-ups in 3 minutes. She can 420 sit-ups at the same rate in ____________ minutes.

We can find the time required to 420 sit ups by multiplying the time required to 105 sit ups by 4.

### Jimmy’s knitwear sold a total of 54 scarves over 6 days equally. At the same rate, number of carves sold in 3 days will be __________.

We can find the number of scarves sold in 3 days by dividing the number of scarves sold in 6 days by 2.

### Jimmy’s knitwear sold a total of 54 scarves over 6 days equally. At the same rate, number of carves sold in 3 days will be __________.

We can find the number of scarves sold in 3 days by dividing the number of scarves sold in 6 days by 2.

### Harvest market sells a crate of 15 pounds of Florida apples for $12. The unit rate is $ per pounds is ________.

Cost per pound multiplied by total number of pound gives the total cost.

### Harvest market sells a crate of 15 pounds of Florida apples for $12. The unit rate is $ per pounds is ________.

Cost per pound multiplied by total number of pound gives the total cost.

### If the weight of 7 books is 120 lbs. Weight of 28 books is ________.

We can find the weight by 28 books by multiplying the weight of 7 books by 4.

### If the weight of 7 books is 120 lbs. Weight of 28 books is ________.

We can find the weight by 28 books by multiplying the weight of 7 books by 4.

### Cost of 8 dozen of bananas is $10. Cost of 24 dozen of bananas is ___________.

We can multiply the cost of 8 dozen bananas by 3 and get the cost of 24 dozen bananas.

### Cost of 8 dozen of bananas is $10. Cost of 24 dozen of bananas is ___________.

We can multiply the cost of 8 dozen bananas by 3 and get the cost of 24 dozen bananas.

### Jenny packed 108 eggs in 9 cartons. At the same rate, 540 eggs can be packed in _________ cartons.

We can find the number of cartons required for 540 eggs by multiplying the number of cartons required for 108 eggs by 5.

### Jenny packed 108 eggs in 9 cartons. At the same rate, 540 eggs can be packed in _________ cartons.

We can find the number of cartons required for 540 eggs by multiplying the number of cartons required for 108 eggs by 5.

### George’s plane climbs 450 feet in 40 seconds. Altitude scaled by the plane keeping same speed in 4 minutes is ________.

We can also find the height scaled in 4 minutes by multiplying the height scaled in 40 seconds by 6.

### George’s plane climbs 450 feet in 40 seconds. Altitude scaled by the plane keeping same speed in 4 minutes is ________.

We can also find the height scaled in 4 minutes by multiplying the height scaled in 40 seconds by 6.