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umka2103 [35]
3 years ago
8

Please need some help on this

Mathematics
2 answers:
elena-14-01-66 [18.8K]3 years ago
4 0

All you have to do is simplify the equation, and then isolate g.

-5 + 7g = 3g + 9                       add 5 to both sides to isolate 7g

7g = 3g + 14                             subtract 3g from both sides to isolate g

4g = 14                                     divide both sides by 4 to isolate g

g = 3.5

The answer is D- 3\frac{1}{2}


Dafna11 [192]3 years ago
3 0
This is the work. the answer is g=1.4

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Solve for x. 2 1/2x − 3/4 (2x+5) = 38 ASAP
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Answer:

  x = 41 3/4

Step-by-step explanation:

(2 1/2)x -(3/4)(2x +5) = 38

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x = 38 +3 3/4 . . . . . . add 15/4

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Another way to solve this is to "clear fractions" by multiplying the whole equation by 4:

  10x -3(2x +5) = 152

  4x -15 = 152 . . . . eliminate parentheses

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Math question #1 please show steps
-Dominant- [34]

Answer:

C

Step-by-step explanation:

An approximation of an integral is given by:

\displaystyle \int_a^bf(x)\, dx\approx \sum_{k=1}^nf(x_k)\Delta x\text{ where } \Delta x=\frac{b-a}{n}

First, find Δx. Our a = 2 and b = 8:

\displaystyle \Delta x=\frac{8-2}{n}=\frac{6}{n}

The left endpoint is modeled with:

x_k=a+\Delta x(k-1)

And the right endpoint is modeled with:

x_k=a+\Delta xk

Since we are using a Left Riemann Sum, we will use the first equation.

Our function is:

f(x)=\cos(x^2)

Therefore:

f(x_k)=\cos((a+\Delta x(k-1))^2)

By substitution:

\displaystyle f(x_k)=\cos((2+\frac{6}{n}(k-1))^2)

Putting it all together:

\displaystyle \int_2^8\cos(x^2)\, dx\approx \sum_{k=1}^{n}\Big(\cos((2+\frac{6}{n}(k-1))^2)\Big)\frac{6}{n}

Thus, our answer is C.

*Note: Not sure why they placed the exponent outside the cosine. Perhaps it was a typo. But C will most likely be the correct answer regardless.

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