- Erin wants to purchase 3 CDs for $10 each. She has $20. How much

Mathematics

2 answers:

son4ous [18]2 years ago

7 0

3 cd at 10 each is 30 dollars. But Erin only has 20 so she would need 10 more dollars in order to purchase all cd.

Answer:T

Step-by-step explanation:

FromTheMoon [43]2 years ago

3 0

Answer:

$10

Step-by-step explanation:

If Erin wants 3 CD's at $10 a piece, that is $30 total. She has $20 which means you find the difference. Total needed: $30 - Money in hand: $20 = $10

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Answer:

Step-by-step explanation:

These problems are based on triangle ratios. You cannot use the Pythagorean theorem to solve them.

The first triangle is a 45 45 90 degree triangle (I'm talking about the angles), and so, the ratio is 1:1: $\sqrt{2\\}$ , so I have to divide the hypotenuse by $\sqrt{2\\}$ to get the legs. The hypotenuse is 15 $\sqrt{6}$ , so that divided by $\sqrt{2\\}$ is 15 $\sqrt{3\\}$ . X is the same length as y because of the triangle ratio, so both x and y for the first triangle are 15 $\sqrt{3\\}$ .

The second triangle is a 30 60 90 degree triangle, so the ratio is x:x $\sqrt{3}$ :2x. The short leg is 7 $\sqrt{3}$ , so 7 $\sqrt{3}$ * 2 is the hypotenuse, which is 14 $\sqrt{3}$ . The long leg is 7 $\sqrt{3}$ * $\sqrt{3}$ , which is 21. So, x for the second triangle is 14 $\sqrt{3}$ , and y for the second triangle is 21.