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3 years ago

9x-2y=-21 , 2x+3y=16

Mathematics

1 answer:

Ratling [72]3 years ago

7 0

Answer: x=−1

Step-by-step explanation:

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Please help quickly.<br> Find the measure of the unknown angle

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2 years ago

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Evaluate the function when x = -3

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Answer:

Step-by-step explanation:

f(-3)=-2(-3)+4=6+4=10

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3 years ago

Sarah Rhodes prepared one gallon of hot

makvit [3.9K]

1 gallon = 128 ounces

Divide total ounces by ounces per cup:

128 / 4 = 32

She had 32 servings

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2 years ago

Write an irrational number that can be added to the irrational number the square root of 15 to get a rational sum of 2

aniked [119]

Answer:

Step-by-step explanation:

if u is an irrational number added to a rational number (sqrt 15) to yield 2, then that would mean u would = root -1.78.....

which means you wouldn't have a real solution. if you want a complex answer, it would be sqrt(1.78)i

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2 years ago

Find the volume of a pyramid with a square base, where the perimeter of the base is 8.2\text{ cm}8.2 cm and the height of the py

7nadin3 [17]

Answer:

$V=18.2cm^3$

Step-by-step explanation:

The volume of the pyramid is given by:

$V=\frac{A_{b}h}{3}$

where $A_{b}$ is the area of the base and $h$ is the height.

We know that the height is:

$h=13cm$

Thus we need to find the area of the square at the base.

The perimeter of the square is:

$p=8.2cm$

this means that the length of the sides of the square is :

$l=\frac{p}{4}\\ \\l=\frac{8.2cm}{4}\\ \\l=2.05cm$

Now we can find the area of the base which the area of the square:

$A_{b}=l^2\\A_b=(2.05cm)^2\\A_b=4.2025cm^2$

and finally we find the volume:

$V=\frac{A_{b}h}{3}$

$V=\frac{(4.2025cm^2)(13cm)}{3}\\ \\V=\frac{54.6325cm^3}{3}\\ \\V=18.2108cm^3$

Which rounded to the nearest tenth of a cubic centimeter is: $V=18.2cm^3$

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2 years ago