MATHEMATICS HIGH SCHOOL

What is the length of BC in the right triangle below 21 and 72

Answers

Answer 1
Answer: Im guessing 21 and 72 are the side lengths for the triangle?

Alright, so since it's a right triangle you can use the Pythagorean theorem or a^2+b^2=c^2

Since i cant see the picture, im going to use some general math so i can figure out if those two sides are the legs or if one of them is the hypotenuse
Alright 
so im guessing the side we're trying to find is the hypotenuse

21^2+72^2=c^2
441+5184=c^2
5625=c^2
√5625=c
75=c

The answer is 75, hope i helped!
Answer 2
Answer:

Answer:75

Step-by-step: just took the test

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Find value of x and y

4.)2x-3y=-15
x=4y

Answers

\left\{\begin{array}{ccc}2x-3y=-15\nx=4y\end{array}\right\n\nsubstitute\n\n2\cdot4y-3y=-15\n8y-3y=-15\n5y=-15\ \ \ \ \ |both\ sides\ :5\ny=-3\n\nx=4\cdot(-3)=-12\n\nSolution:x=-12\ and\ y=-3.
2x - 3y = -15
x = 4y
substitute x frm eq2 to eq1
2 (4y) - 3y = -15
8y - 3y = -15
5y = - 15
y = -3
substitute y in eq2
x = 4(-3)
x = -12
y = -3 , x = -12

The number of possible different 12-letter arrangements of the letters in the word “TRIGONOMETRY” is represented by

Answers

We will use formula for Permutations with repetition:
P(n, m1,m2,m3) = n! / m1! · m2! · m3!
In the word TRIGONOMETRY we have repetitions of letters: T, R and O.
P=(12!)/(2!*2!*2!)= (12*11*10*9*8*7*6*5*4*3*2*1)/(2*1*2*1*2*1) = = 59,875,200 

What is
x=5y-1
x+2y=13

Answers

x=5y-1
x+2y=13 => 5y -1 +2y = 13 => 7y = 14 => y = 2 => x = 9;

Answer: x = 9, y = 2

Step-by-step explanation:

plug in values and solve.

Write 3.2x10 square (-5) in standered form

Answers

I believe it would be 320000 sorry if I didn't really help

Please help! Question two

Answers

Answer:

4y+6

Step-by-step explanation:

Perimeter is adding up the outside

so.. there are y+y = 2y

y+3 + y+3 = 2y+6

2y+6 + 2y = 4y+6

Hope this helps :)

A store uses the expression –2p + 50 to model the number of backpacks it sells per day, where the price, p, can be anywhere from $9 to $15. Which price gives the store the maximum amount of revenue, and what is the maximum revenue? (Revenue = price mc023-1.jpg number of backpacks.) $9.00 per backpack gives the maximum revenue; the maximum revenue is $32.00. $12.00 per backpack gives the maximum revenue; the maximum revenue is $312.00. $12.50 per backpack gives the maximum revenue; the maximum revenue is $312.50. $15.00 per backpack gives the maximum revenue; the maximum revenue is $20.00.

Answers

Revenue = price * number of backpacks
number of backpacks = -2p + 50

p = 9 ; -2(9) + 50 = -18 + 50 = 32
revenue = 9 * 32 = 288

p = 12 ; -2(12) + 50 = -24 + 50 = 26
revenue = 12 * 26 = 312

p = 12.50 ; -2(12.50) + 50 = -25 + 50 = 25
revenue = 12.50 * 25 = 312.50   GIVES THE MAXIMUM REVENUE

p = 15 ; -2(15) + 50 = -30 + 50 = 20
revenue = 15 * 20 = 300

Answer:

Its C on Edge

Step-by-step explanation:

$12.50 per and maximum of $312.50

Took the Test and got it right.
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