You have 3000 dollars to spend on a laptop. suppose the tax rate 6.78%. what is the maximum you can spend on a laptop if you know you will also be purchasing a 25 dollar case?

  $2784.51

Step-by-step explanation:

You require ...

  (total with tax) ≤ 3000

  (total with tax) = (total before tax) + 0.0678·(total before tax)

So,

  (total before tax) · 1.0678 ≤ 3000

  total before tax ≤ 2809.51

With ...

  total before tax = laptop cost + case cost

we have ...

  laptop cost + case cost ≤ 2809.51

  laptop cost ≤ 2809.51 - 25

  laptop cost ≤ 2784.51

The maximum you can spend on a laptop is $2784.51.

B. 2.75 mph

Step-by-step explanation:

If it took him 2 hours to walk 5.5 miles, 5.5 ÷ 2 = 2.75, which is what he walked in a single hour, meaning he was walking 2.75 mph