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3 years ago

A science test, which is worth 100 points, consists of 24 questions. Each question is worth either 3 points or 5

Mathematics

1 answer:

Semmy [17]3 years ago

8 0

3x + 3y = 72

2y = 28

y = 14

x = 24 - 14 = 10

The test contains 10 three-point questions and 14 five-point questions

please mark me brainliest!

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Solve: 2x2-x = 21 {-7/2,3} {-3, 7/2}

Sergio039 [100]

Answer:

The answer is (-3,7/2)

Step-by-step explanation:

$2 {x}^{2} - x - 21 = 0 \\ (2x - 7)(x + 3) = 0 \\ 2x - 7 = 0 \: \: \: or \: \: x + 3 = 0 \\ x = \frac{7}{2} \: \: and \: x = - 3$

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2 years ago

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luda_lava [24]

Answer:

600 sq in

Step-by-step explanation:

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2 years ago

What is the length of the diagonal of a rectangle whose width is 100 centimeters and whose length is 180 centimeters. ( round th

Aloiza [94]

D keep trying for your family

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3 years ago

Read 2 more answers

Solve for x showing work

natali 33 [55]

X = 112
See attachment file below.

Hope it helped!

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2 years ago

The power P of a jet of water is jointly proportional to the cross sectional area A and to the cube ofthe velocity V. (a) Write

anastassius [24]

Answer:

a) $P=kAV^3$

b) 54

Step-by-step explanation:

If one quantity, A, is jointly proportional to other 2 quantities (B & C), we can write proportionality equation as:

$A=k*B*C$

Where

k is the proportionality constant

Now, for this problem, P is jointly proportional to A and CUBE OF V, so we can write:

$P=kAV^3$

Now velocity, V, is triples, which means it becomes 3V

Also, cross sectional area, A, is doubled, which means it becomes 2A

Let's put these into formula and see the difference:

$P=kAV^3\\P=k(2A)(3V)^3\\P=k(2A)(27V^3)\\P=(2*27)kAV^3\\P=54kAV^3$

So, power is multiplied by a factor of 54. Power becomes 54 times if Area is doubled and velocity is tripled ( as seen ).

8 0

2 years ago