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Anni [7]
3 years ago
7

Evaluate the expression 7x2y, when x = 3 and y = 4. ^ The 2 is too the power of whatever x is.

Mathematics
2 answers:
alexandr402 [8]3 years ago
6 0
7x^2y \hbox{ when } x=3 \hbox{ and } y=4 \\ \Downarrow \\ 7 \times 3^2 \times 4=7 \times 9 \times 4=\boxed{252}
vredina [299]3 years ago
6 0

Answer:

The answer would be 252. I know this because I got it correct on my study guide.

Step-by-step explanation:

First I write down the problem like this...      7 (3) ² 4.

Since the # is in parenthesis I multiply 3 by the power of ² which equals to nine. (Remember, when I am multiplying 3 to the power of ² I do not multiply 3 times 2. I multiply 3 by itself 2 times. 3 x 3 = 9. I think you get the point.)

Now, you write it like this.... 7 x 9 x 4. All you have to do know is multiply. You can start anyway you like. If I multiply 9 x 4 first that equals 36. 36 x 7 gives me 252.

The same thing is the other way around. If I multiply 7 x 9 that equals 63. 63 x 4 also equals 252!

I hope this helped you. Please mark as Brainliest and let me know if I could help you with future questions. Have a Great Day Everyone!

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Solve this equation: -3r -6(-7-10r)
blondinia [14]
Answer: 57r + 42

Step by step explanation:

-3r - 6(-7 - 10r)

Distribute -6 through the parenthesis

-3r + 42 + 60r

Collect the like terms

57r + 42
7 0
3 years ago
Find the volume of the composite solid. Round your answer to the nearest tenth.​
amm1812

Answer:

Volume of the Figure =825.38m^3

Step-by-step explanation:

Volume of the figure = Volume of the Upper cone+Volume of the lower cone

Volume of a cone = \pi *r^2*\frac{h}{3}

Volume of the Upper Cone with  

height=12m

radius=6m

                       3.14*6*6*\frac{12}{3}

                        =3.14*6*6*4\\\\=3.14*36*4\\\\=3.14*144\\\\=147.14m^3

Volume of the Lower cone with radius=6m and height=18m

                            =3.14*6*6*\frac{18}{3} \\\\=3.14*6*6*6\\\\=3.14*36*6\\\\=3.14*216\\\\=678.24m^3

Volume of the Whole Figure =   147.14+678.24

Volume of the Figure  =825.38m^3

4 0
3 years ago
Chip and dale are driving in a toy engine around the Christmas tree at a speed of 300 miles/hour. how many minutes will it take
Deffense [45]

Using proportions, it is found that it will take them 0.00248548 minutes to do one loop.

<h3>What is a proportion?</h3>

A proportion is a fraction of a total amount, and the measures are related using a rule of three.

In this problem, according to their speed, in 60 minutes, they drive 300 miles. In how many minutes will they drive 20 m = 0,0124274 miles?

The <em>rule of three</em> is:

60 min - 300 miles

x min - 0.0124274 miles

Applying cross multiplication:

300x = 60 \times 0.0124274

x = \frac{60 \times 0.0124274}{300}

x = 0.00248548

It will take them 0.00248548 minutes to do one loop.

More can be learned about proportions at brainly.com/question/24372153

7 0
2 years ago
Write the equation of the conic section with the given properties:
timurjin [86]

Answer:

\frac{x^2}{64} + \frac{y^2}{25} =1

Step-by-step explanation:

An ellipse with vertices (-8, 0) and (8, 0)

Distance between two vertices = 2a

Distance between (-8,0) and (8,0) = 16

2a= 16

so a= 8

Vertex is (h+a,k)

we know a=8, so vertex is (h+8,k)

Now compare (h+8,k) with vertex (8,0) and find out h and k

h+8 =8, h=0

k =0  

a minor axis of length 10.

Length of minor axis = 2b

2b = 10

so b = 5

General formula for the equation of horizontal ellipse is

\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b} =1

a= 8 , b=5 , h=0,k=0. equation becomes

\frac{(x-0)^2}{8^2} + \frac{(y-0)^2}{5} =1

\frac{x^2}{64} + \frac{y^2}{25} =1

5 0
3 years ago
1. Amani is organizing her sticker collection.
11Alexandr11 [23.1K]
39 stickers in each album
3 0
3 years ago
Read 2 more answers
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