In 2012, five U.S postal stamps cost $2.20. how much did seven stamps cost? answer please

2 answers:

6 0

This is very easy to solve. You know that 5 stamps costs $2.20. To find out how much 1 stamp is you have to divide $2.20 by 5.
$2.20/5=$0.44
So now we know that 1 stamp is 44 cents.
Since you want to know how much 7 stamps cost, you have to add two more stamps to the stamps you already have.
5 stamps=$2.20+ 1 stamp= $0.44 + 1 stamp= $0.44
2.20+0.44+0.44= 3.08
So, 7 stamps costs $3.08.
Get it? Let me know if you still don't understand.

Kruka [31]3 years ago

3 0

You'd do $2.20 and multiply it by seven. Which would give you $15.40, according to my calculations.

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Answer:

Step-by-step explanation:

The right triangle on the right side of the figure has a height of 6 (two same sides lengths) and a base of 3.

x is the hypotenuse (side opposite of 90 degree angle).

We can use the pythagorean theorem to find x. The pythagorean theorem tells us to square each leg (height and base) of the triangle and add it. It should be equal to the hypotenuse square.

For this triangle it means, we square 6 and 3 and add it. It should be equal to x squared. Then we can solve. Shown below:

$6^2 + 3^2 = x^2\\36 + 9 = x^2\\45 = x^2\\x=\sqrt{45}$