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Phoenix [80]
3 years ago
6

Math Problem:

Mathematics
1 answer:
kirza4 [7]3 years ago
3 0

Answer:

Her answer is not reasonable. Her average is 83.

Step-by-step explanation:

Add all of her test grades together (96+82+78+76=332)

To find the average, you need to add all test grades she got and then divide the sum by the total number of numbers added (in this case, we added 4 tests together, so we need to divide by 4)

\frac{332}{4} =83

So she added wrong and forgot to divide by the total number of tests.

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marysya [2.9K]

Answer:

width of the rectangle=x=4in and length of the rectangle=11in

Step-by-step explanation:

Let the width of the rectangle be x, then according to the question, length is one less than three times its width that is l=3x-1.

Now, width=b=x and length=l=3x-1, thus

Perimeter of the rectangle= 2(l+b)

⇒30=2(3x-1+x)

⇒15=(3x-1+x)

⇒15=4x-1

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⇒x=4in

Thus, width of the rectangle=x=4in and length of the rectangle=l=3x-1=3(4)-1=12-1=11in.

5 0
3 years ago
2x – 3y = 18<br> Solve for y.
Nataly [62]

Answer:

y= -6+2/3x

Step-by-step explanation:

2x-3y=18

Minus the 2x from both sides

-3y=18-2x

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Lastly divide both sides by 3

3y÷3= -18÷3+2x÷3

7 0
3 years ago
Solve the quadratic by factoring.<br> x^2-5x-31=5
torisob [31]

Answer:

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Step-by-step explanation:

make one side equal to zero:

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{x }^{2}  - 9x + 4x - 36 = 0

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(x + 4)(x - 9) = 0

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7 0
3 years ago
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