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Sphinxa [80]
2 years ago
13

What value of x makes the equation true?3(x − 4) = 15 A.–1 B.1 C.7 D.9

Mathematics
1 answer:
Paha777 [63]2 years ago
6 0

Answer:

D. 9

Step-by-step explanation:

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2x+34=6-5x pls help show work I’ll mark as brainliest!!
fomenos

Answer:

x = -4

Step-by-step explanation:

2x + 34 = 6 - 5x

Subtract 34 from both sides.

2x = -28 - 5x

Add 5x to both sides.

7x = -28

Divide both sides by 7.

x = -4

Proof:

2x + 34 = 6 - 5x

Substitute variable.

2(-4) + 34 = 6 - 5(-4)

Multiply.

-8 + 34 = 6 + 20

Add.

26 = 26

4 0
3 years ago
Read 2 more answers
Subtract. (4x^2+8x−2)−(2x^2−4x+3) Enter answer, in standard form
denis-greek [22]
(4x^2+8x-2)-(2x^2-4x+3)\\\\=4x^2+8x-2-2x^2+4x-3\\\\=(4x^2-2x^2)+(8x+4x)+(-2-3)\\\\=\boxed{2x^2+12x-5}
7 0
3 years ago
Find an exact value.<br><br> <img src="https://tex.z-dn.net/?f=cos%28-%20%5Cfrac%7B%20%5C77%20%5Cpi%20%20%20%20%7D%7B12%7D%29%20
xxTIMURxx [149]
\cos\left(-\dfrac{7\pi}{12}\right)=\cos\dfrac{7\pi}{12}

Recall that

\cos^2x=\dfrac{1+\cos2x}2

Let x=\dfrac{7\pi}{12}, so that

\cos^2\dfrac{7\pi}{12}=\dfrac{1+\cos\dfrac{7\pi}6}2=\dfrac{1-\dfrac{\sqrt3}2}2=\dfrac{2-\sqrt3}4
\cos\dfrac{7\pi}{12}=\pm\sqrt{\dfrac{2-\sqrt3}4}=\pm\dfrac{\sqrt{2-\sqrt3}}2

Since the angle \dfrac{7\pi}{12} lies in the second quadrant, you know that the cosine must be negative, so

\cos\dfrac{7\pi}{12}=-\dfrac{\sqrt{2-\sqrt3}}2
5 0
3 years ago
lindsay bedford works at the baseball cap shop. she is paid $6.50 per hour plus $0.45 for each cap she embroiders. how many caps
crimeas [40]

15 caps are needed so that she can earn $85 in an 8hour day.

<h3>How is the direct equation calculated?</h3>

The direct variation equation has the form y = kx, where k is the constant proportionality. It is a linear equation with two variables. In a coordinate plane, the direct variation graph is a straight line. A constant is the ratio of two quantities that vary directly. Relationship between two variables that can be described mathematically by an equation where one variable equals a constant multiplied by the other.

For each hour she is compensated $6.50 with $0.45.

For an 8 hour day =6.50 *8 + 0.45x

Let x be the caps and earning is $85

6.50*8+0.45*x=85

=> 52+0.45x=85

=> 0.45x=33

=> x=15 (approx.)

To learn more about direct variation , click here:

brainly.com/question/14254277

#SPJ4

8 0
1 year ago
9.1|| m<br> mZ1 = 1<br> mZ2 =<br> 49°<br> 2<br> mZ3 =<br> 3/73<br> 5<br> m24 =<br> mZ5 =
loris [4]

Answer:

1010101011010101010191991191918181717161661521919191181717161626363839303374646474848393939383747463636367337733737374760

3 0
3 years ago
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