A typical high-income household in 1980 earned $140,397. A similar household in 2009 earned $168,727. What was the relative increase in income for these households from
1980 to 2009? Round to the nearest one percent.

20.2 %

Step-by-step explanation:

A typical high-income household in 1980 earned $140,397.

A similar household in 2009  earned $168,727.

We need to find the relative increase in income for these households from  1980 to 2009.

It can be calculated as follows :

So, the required percent is 20.2%.

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

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: