Answer:
D
Step-by-step explanation:
Using Pythagoras' identity for right triangles
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides.
Here PR is the hypotenuse, thus
13² = 169
5² + 12² = 25 + 144 = 169
Thus Δ PQR is a right triangle because 5² + 12² = 13² → D
Using the percentage concept, it is found that 25% of 6th graders are involved in the yearbook club.
<h3>What is a percentage?</h3>
The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:

In this problem, 10 out of 10 + 24 + 6 = 40 6th graders are involved in the yearbook club, hence the corresponding percentage is given by:

More can be learned about percentages at brainly.com/question/10491646
Answer:
3y(y−5)
Step-by-step explanation:
I factored the expression
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Answer:
He can have 8 cards in each pile amounting at a total of 15 piles of cards.