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Ghella [55]
3 years ago
9

Pls help 10 points!!!​

Mathematics
1 answer:
Sunny_sXe [5.5K]3 years ago
6 0

Answer:

3rd one

Step-by-step explanation:

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Find the average value of f over region
yan [13]
The area of D is given by:

\int\limits \int\limits {1} \, dA = \int\limits_0^7 \int\limits_0^{x^2} {1} \, dydx  \\  \\ = \int\limits^7_0 {x^2} \, dx =\left. \frac{x^3}{3} \right|_0^7= \frac{343}{3}

The average value of f over D is given by:

\frac{1}{ \frac{343}{3} }  \int\limits^7_0  \int\limits^{x^2}_0 {4x\sin(y)} \, dydx  = -\frac{3}{343}  \int\limits^7_0 {4x\cos(x^2)} \, dx  \\  \\ =-\frac{3}{343} \int\limits^{49}_0 {2\cos(t)} \, dt=-\frac{6}{343} \left[\sin(t)\right]_0^{49} \, dt=-\frac{6}{343}\sin49
3 0
3 years ago
How many ml of 20 percent acid should be added to pure acid to make 70 ml of 30 percent acid?
Novay_Z [31]

Answer:

61.25%

Step-by-step explanation:

How many ml of 20 percent acid should be added to pure acid

to make 70 ml of 30 percent acid?

:

let x = amt of 20% mixture

then

(70-x) = amt of pure acid

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0.20x + (70-x) =0 .30(70)

0.20x + 70 - x = 21

= 21 - 70

-0.8x =-49

x = 61.25%

x = +61.25 ml of 20% stuff

8 0
3 years ago
A salesperson sold 30% of their books in stock on Monday. Then they sold 60% of their remaining books on Tuesday. What percent o
Valentin [98]

Answer:

10%

Step-by-step explanation:

60% + 30%=90%

so they have 10%of the original amount left.

7 0
4 years ago
Jaquin would like to install a rug in her square living room. Her living room has an area of 121 square feet. What should the si
Amanda [17]

Answer:

11 feet

Step-by-step explanation:

All the sides of a square are equal

the area of a square = length²

121 ft² = length²

to determine the length find the square root of the area, 121

√121 = 11 feet

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3 years ago
What is the surface area of the cylinder with height g in and radius 4 in? Round your
zaharov [31]

Answer:

if you want ans area of cylider is 2πrh+2πr2

Step-by-step explanation:

need thanks and make me brainiest if it helps you

4 0
3 years ago
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