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Anastaziya [24]

3 years ago

6

Solve. 2b + 4 + 5b + 7 = - 10 A. -3 B. - 1/7 C. 1/7 D. 3

2 answers:

timama [110]3 years ago

8 0

To solve this equation, you have to substract b with b and numbers with numbers first :

<span>2b + 4 + 5b + 7 = - 10</span>
7b + 11 =-10

Afterwards, you combine letters at the left and the numbers at the right :

7b = -21

Now instead of getting 7b, we want to obtain just b, therefore we divide by 7 in each member.

b = -21/7
b = -3.

Therefore, the answer is A. -3.

Hope this helps !

Photon

NARA [144]3 years ago

5 0

It's A, just as I said before,
7b + 11 =-10
7b = -21
b = -21/7
b = -3

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irina [24]

Answer:

$12\sqrt{3}$ feet

Step-by-step explanation:

In a 30-60-90 triangle, the ratios of the side lengths of the triangle is $1:\sqrt{3} :2$

Where 1 is the shortest leg, root(3) is the longer leg, and 2 is the hypotenuse.

First we can set x equals to the length of the original pole, and so the shorter leg has a length of x/3 and using the ratio of side lengths, we can find that:

$\frac{x}{3} * \sqrt{3} = \frac{\sqrt{3} x}{3} = 12$

Solving for x, we find that

$x=\frac{36}{\sqrt{3} } = \frac{36 * \sqrt{3} }{\sqrt{3} * \sqrt{3} } = \frac{36 \sqrt{3} }{3} = 12\sqrt{3}$

So the length of the original pole would be $12\sqrt{3}$ feet

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