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ValentinkaMS [17]

3 years ago

15

If x=4 and y=-2, what is the value of

2}" alt="\frac{1}{2}" align="absmiddle" class="latex-formula"> xy²?

1 answer:

Arisa [49]3 years ago

7 0

Answer:

8

General Formulas and Concepts:

<u>Pre-Alg</u>

Order of Operations: BPEMDAS

Step-by-step explanation:

<u>Step 1: Define</u>

1/2xy²

x = 4

y = -2

<u>Step 2: Solve</u>

Substitute: 1/2(4)(-2)²
Exponents: 1/2(4)(4)
Multiply: 2(4)
Multiply: 8

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Write an equation (in factor form) that has solutions of x=2 or x=3

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This means that when you write your equation you will have in x somewhere in it the X will be the number 2 or the number 3. hope thia helps good luck!

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Use the quadratic formula to solve the equation -3x2-x-3=0

Novosadov [1.4K]

Answer:

$x=\frac{1+\sqrt{35}i}{-6}\,\, and\,\, x=\frac{1-\sqrt{35}i}{-6}\\$

Step-by-step explanation:

the quadratic formula is:

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

a= -2, b = -1 and c =-3

Putting values in the formula

$x=\frac{-(-1)\pm\sqrt{(-1)^2-4(-3)(-3)}}{2(-3)}\\x=\frac{1\pm\sqrt{-35}}{-6}\\x=\frac{1+\sqrt{-35}}{-6}\,\, and\,\, x=\frac{1-\sqrt{-35}}{-6}\\We\,\, know \,\,that \,\,\sqrt{-1} = i \\x=\frac{1+\sqrt{35}i}{-6}\,\, and\,\, x=\frac{1-\sqrt{35}i}{-6}\\$

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3 years ago

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Harper's hair is 15 inches long. She gets

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Answer:

7 inches.

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Betty paints twice as fast as Dan. Working together, Dan and Betty can paint 2, 400 square feet in 4 hours. Another employee, Su

Natalija [7]

Answer:

2670 square feet. Option e.

Step-by-step explanation:

Dan and Betty can paint 2,400 square feet in 4 hours.

They can paint in one hour $\frac{2400}{4}$ = 600 square feet.

Since given that Betty paints twice as fast as Dan. Let us take an equation:

Let Betty = B, Dan = D and Sue = S

B = 2D

4(B+D) = 2400

4B + 4D = 2400

12D = 2400

D = 200 sq. ft.

B = 2D = 400 sq. ft.

Therefore, Dan can paint 200 square feet in 1 hour and Betty paints twice 400 square feet in 1 hour.

Now given three of them can paint 3,600 square feet in 3 hours.

3( B+D+S) = 3600

3B + 3D + 3S = 3600

3(400) + 3(200) + 3(S) = 3600

1200 + 600 + 3S = 3600

S = 600 Sq. ft.

Sue can paint 600 square feet in one hour.

So sue can paint in 4 hours and 27 minutes.

$(\frac{4+27}{60})$ × 600

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8 0

3 years ago

zubka84 [21]

Answer:

I think that it is ethier the last to bottom or second to bottom I hope this helps but I really feel like its one of them so just trust your gut!

Step-by-step explanation:

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