Question

For how many integers x is the equation 22x+1 = 3x - 3 true?

Answer 1

REmember that

the speed is equal to divide the distance by the time

so

speed=d/t

in this problem we have

speed=3.6x10^4 miles/hour

d=7.2x10^8 miles

substitute in the formula

`3.6\cdot10^4=(7.2\cdot10^8)/(t)`

solve for t

`\begin{gathered} 3.6\cdot10^4=(7.2\cdot10^8)/(t) \\ t=(7.2\cdot10^8)/(3.6\cdot10^4) \\ t=2.0\cdot10^4\text{ hours} \end{gathered}`

therefore

answer is option D