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kramer
3 years ago
7

I have no idea what im doing lol pleasee help

Mathematics
1 answer:
Harman [31]3 years ago
8 0

Answer:

Your answer would be 254.47

Step-by-step explanation:

Here, you can use this formula A=πr2

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(c) Write these fractions in order of size.
julsineya [31]

Answer:

11/12, 3/4, 5/8, 9/20 (from smallest to biggest)

8 0
3 years ago
A tank contains 1000 L of pure water. Brine that contains 0.05 kg of salt per liter of water enters the tank at a rate of 5 L/mi
Margaret [11]

Answer:

a) y(t)=0.65\frac{Kg}{min}(tmin)

b) y(40)=26Kg

Step-by-step explanation:

Data

Brine a (Ba)

V_{Ba}=5\frac{Lt}{min}\\  Concentration(Bca)=0.05\frac{Kg}{Lt}

Brine b (Bb)

V_{Bb}=10\frac{Lt}{min}\\  Concentration(Bcb)=0.04\frac{Kg}{Lt}

we have that per every minute the amount of solution that enters the tank is the same as the one that leaves the tank (15 Lt / min)

, then the amount of salt (y) left in the tank after (t) minutes: y=V_{Ba}*B_{ca}+V_{Bb}*B_{cb}=5\frac{Lt}{min}*0.05\frac{Kg}{Lt}+10\frac{Lt}{min}*0.04\frac{Kg}{Lt}=\\0.25\frac{Kg}{min}+0.4\frac{Kg}{min}=0.65\frac{Kg}{min}

Finally:

a) y(t)=0.65\frac{Kg}{min}(tmin)

b) y(40)=0.65\frac{Kg}{min}(40min)=26Kg

being y(t) the amount of salt (y) per unit of time (t)

5 0
3 years ago
A parallelogram has sides of 18 and 26 ft, and an angle of 39° . Find the shorter diagonal
Fed [463]

Answer:

16.51

Step-by-step explanation:

In a parallelogram, the opposite angles are always equal in measure. So two of the angles in the parallelogram measure 39 degrees each.

The sum of angles of the parallelogram must be 360 degrees. Let the other two angles be x degree each. We can set up the following equation for the angles:

39 + 39 + x + x = 360

78 + 2x = 360

2x = 282

x = 141

This means, the other two angles measure 141 degree each. The shorter diagonal will be opposite to the shorter angle.

Hence, the diagonal opposite to the angle 39 degree will be the shorter one. A diagonal divides the parallelogram in two triangles. So we will have two sides and an included angle and we have to find the third side of the triangle which can be found using the law of cosines. Let the third side be c as shown in image below, using the law of cosines, we can write:

c^{2} = a^{2}+ b^{2} -2ab cos(\gamma)\\\\c^{2}=18^{2}+26^{2}-2(18)(26)cos(39)\\\\ c^{2}=272.59\\\\ c=16.51

Thus the shorter diagonal will be 16.51 feet in measure.

3 0
3 years ago
Zack has a old car. He wants to sell it for 60% off the current price. The market price is $500. How much money would he receive
oksano4ka [1.4K]
Since it would be 60% of the original price which is 500 it would have be $300
5 0
3 years ago
Read 2 more answers
Pls help Simplify. 8(12 - p) 20 - (8+p) 96 - 8p 96 - p 96p
katen-ka-za [31]
<h2>Answer: = −p97−8p96−256p+1152</h2>

Step-by-step explanation:

<u>Let's simplify step-by-step</u><u>.</u>

8(12−p)(20)−(8+p)(96)−8p96−p96p

Distribute:

=−160p+1920+−96p+−768+−8p96+−p97

<u>Combine Like Terms:</u>

=−160p+1920+−96p+−768+−8p96+−p97

=(−p97)+(−8p96)+(−160p+−96p)+(1920+−768)

=−p97+−8p96+−256p+1152

* Hopefully this helps:) Mark the brainliest:)!!!!

4 0
3 years ago
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