First one costs $720, second costs $700 so the second one the<span> 1,000 dollar computer discounted to 30%</span>
(2, 8) because 8 is not negative
hope it helps,
xXbeautyXx
The answer is (x,y) = (-2, 16)
do you need an explanation as well?
The ODE is separable:

Integrating both sides gives

The bicycle with a 30-inches diameter rolls approximately 28.8 more than a tire with the diameter with 21-inches.
<u><em>How to solve:</em></u>
- First use the formula: C = 3.14d
- Replace the d value with 30 and solve the equation:
C = 3.14 x 30 ⇒ 94.2477796077
- Then solve the equation again but 21 as the d value:
C = 3.14 x 21 ⇒ 65.9734457254
- Then subtract 65.9734457254 from 94.2477796077 to get the approx. answer of 28.8