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Arada [10]
3 years ago
12

What is the solution? 21=42−3r A r=−8 B r=−7 C r = 7 D r = 8

Mathematics
2 answers:
valentina_108 [34]3 years ago
8 0
C. R = 7. 3x7= 21-42=21
g100num [7]3 years ago
4 0

Answer:

C r=7

Step-by-step explanation:

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The floor of the school art closet is be tiled. The closet shaped like a parallelogram. The parallelogram has a base of 16.5 fee
son4ous [18]
The area of the parallelogram is given by:
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 Substituting values we have:
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3 0
3 years ago
Hi I need help with this, I am very confused
AlladinOne [14]

Answer:

1/81

Step-by-step explanation:

P(1st ticket is a winner) = 1/9

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P(2nd ticket is a winner) = 1/9

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7 0
3 years ago
5cosx -2sin(x/2) +7=0<br>Help me to find x step by step<br>pls​
miskamm [114]

Answer:

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) = cos^{2}x - sin^{2}x

2. Pythagorean identity:

cos^{2}x + sin^{2}x = 1

Back to your problem, replacing the variable by the above:

5cosx-sin\frac{x}{2}+7 = 0

5(cos^{2}\frac{x}{2}-sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0 By Double-angle formula

5(1 - 2sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0 By Pythagorean identity

Given y = \frac{x}{2}

5(1-2sin^{2}y) - 2siny + 7 = 0

10sin^{2}y+2siny-12=0

5sin^{2}y+siny-6=0

(5siny + 6)(siny - 1)=0, we know -1 < sinx < 1, for every x ∈ R

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y = \frac{x}{2}

x = 180

8 0
3 years ago
Please help!!!
Kipish [7]
F - 12 = -35
f - 12 + 12 = -35 + 12
f = -23
3 0
3 years ago
What decimal is equivalent to 10/3?
fiasKO [112]

Answer:

3.33333333 . . .

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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