C.6 d.5 geometry math question no guessing

Set up a ratio 50 / 130 = x+19 / 78

Cross multiply:

50 * 78 = 130 * x+19

3900 = 130(x+19)

Use the distributive property:

3900 = 130x + 2470

Subtract 2470 from each side:

1430 = 130x

Divide both sides by 130

x = 1430 / 130

X = 11

The answer is B. 11

answer: solve 5\cdot 2^x=2405⋅2  

x

=2405, dot, 2, start superscript, x, end superscript, equals, 240.

solution

to solve for xxx, we must first isolate the exponential part. to do this, divide both sides by 555 as shown below. we do not multiply the 555 and the 222 as this goes against the order of operations!

\begin{aligned} 5\cdot 2^x& =240 2^x& =48 \\ \end{aligned}  

5⋅2  

x

2  

x

​    

=240

=48

​

step-by-step explanation:

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