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Scrat [10]
3 years ago
11

Ratio of boys to girls is 2:7. There are 250 more girls than boys. How many boys are there

Mathematics
2 answers:
nata0808 [166]3 years ago
4 0
I hope this helps you

trasher [3.6K]3 years ago
3 0
100boys

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PLEEEASE HELLLLP!!!!!!! If x+7=2y and y=2x−1, what is the value of y?
viktelen [127]

Answer:

13

Step-by-step explanation:

We can add 1 to both sides of the second equation and divide by 2 to get

x = (y-1)/2

We can then substitute x in the first equation to get

(y-1)/2 + 7 = 2y

Multiply by 2

y-1 + 14 = 2y

Subtract y and combine like terms

y = 13

6 0
3 years ago
Y = 3 sin2x, y = 0, 0 ≤ x ≤ π; about the x−axis
Dominik [7]
I assume you're revolving the region with those bounds about the x-axis, and supposed to find the volume.

Via the disk method,

\displaystyle\pi\int_0^\pi(3\sin2x)^2\,\mathrm dx=9\pi\int_0^\pi\sin^22x\,\mathrm dx

Recall the half-angle identity for sine:

\sin^2t=\dfrac{1-\cos2t}2
\implies\displaystyle\frac{9\pi}2\int_0^\pi(1-\cos4x)\,\mathrm dx
=\displaystyle\frac{9\pi}2\left(x-\frac14\sin4x\right)\bigg|_{x=0}^{x=\pi}
=\dfrac{9\pi^2}2
8 0
3 years ago
1<br> Identify the missing symbols: 2/5 4/5 5/5
riadik2000 [5.3K]

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3 years ago
Each tile costs 80 cents how much change would i get back if i bought 192 tiles with 200 dollars
Maksim231197 [3]
Cost of 192 tile at $0.80 =   192 x .80 = $153.60
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3 0
3 years ago
A charity sent out 700 fundraising letters and received 210 contributions in response. What was the percent of response?
Pavlova-9 [17]
To find the answer, you have to make a proportion. 210 out of 700, or 210/700 is equal to x/100. So, 210/700=x/100. Then to solve the proportion, you must cross multiply. 210 times 100 is 21,000. Then, you must divide 21,000 by 700, which is 30. The 30 represents 30/100, which is 30%
The answer is 30%.


8 0
3 years ago
Read 2 more answers
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