All categories

2 years ago

Elizabeth spent exactly $7 for some 15-cent stamps and some 31-cent stamps. How many 15-cent stamps did she buy?

Mathematics

1 answer:

MAVERICK [17]2 years ago

4 0

By solving an equation, we conclude that she will get 26 of the 15-cent stamps.

<h3>How many 15-cent stamps did she buy?</h3>

First, let's define the variables:

x = number of 15-cent stamps bought.
y = number of 31-cent stamps bought.

We know that she spends exactly $7, so we have the linear equation:

$0.15*x + $0.31*y = $7.00

Now we want to solve this for x, so we need to isolate it:

x = ($7.00 - $0.31*y)/$0.15

Where x and y must be two whole numbers (notice that the value of x depends of the value of y).

Now you can try to evaluate in different whole values of y, such that the outcome (x in this case) is also a whole number.

The first value of y such that x is also a whole number is y = 10.

x = ($7.00 - $0.31*10)/$0.15 = 26

Then we conclude that she will get 26 of the 15-cent stamps.

If you want to learn more about linear equations:

brainly.com/question/1884491

#SPJ1

You might be interested in

A triangle lies entirely in Quadrant 1. In which quadrant will the triangle lie after each rotation about (0, 0)?

tester [92]

Well, if the the triangle is rotated clockwise it will lie in quadrant 4. if it is rotated anticlockwise it will lie on quadrant 2
hope this helps

6 0

3 years ago

Read 2 more answers

Part A

ozzi

Answer:

As the sucrose concentration is higher in the solution, the water in the balloon, where the sucrose is less concentrated, will tend to leave and try to dilute the outer solution until both sucrose concentrations are equal. But as the water leaves the balloon, the concentration inside will increase, so it will flow outside until both concentrations are equal and not until the outer concentration is similar to the initial concentration in the balloon.

Step-by-step explanation:

Hope this helps:)

3 0

3 years ago

SOMEONE PLEASE HELP! A survey of a group of seventh graders and a group of teachers at a local middle school asked how many sibl

erastovalidia [21]

<em>Note: You may have missed to add the dot plots chart, so I found the chart after a little research and hence, I am attaching it and based on that dot plot chart I am solving the question which anyways would clear you concept.</em>

Answer:

''The median for the students is 2 and the median for the teachers is 3'' is the right option which compares the medians of the data.

Step-by-step explanation:

Data for students from the dot plot in order

$0,\:0,\:1,\:1,\:1,\:1,\:2,\:2,\:2,\:2,\:2,\:2,\:2,\:3,\:3,\:3,\:3,\:3,\:4,\:4$

Calculating Median for students:

0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4

As you can see, we do not have just one middle number but we have a pair of middle numbers i.e. 2 and 2, so the median is the average of these two numbers:

Median = (2+2)/2

=4/2

= 2

Data for teachers from the dot plot in order

$0, 1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 8$

Calculating Median for teachers:

0, 1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 8

As you can see, we do not have just one middle number but we have a pair of middle numbers i.e. 3 and 3, so the median is the average of these two numbers:

Median = (3+3)/2

=6/2

= 3

Therefore, ''the median for the students is 2 and the median for the teachers is 3'' is the right option which compares the medians of the data.