My calculator says bad expression.
Answer: 9
Step-by-step explanation:
Use Pythagorean's Theorem for a right triangle.
![a^2+b^2=c^2](https://tex.z-dn.net/?f=a%5E2%2Bb%5E2%3Dc%5E2)
![(\sqrt{63}) ^2+x^2=12^2\\63+x^2=144\\x^2=81\\x=9](https://tex.z-dn.net/?f=%28%5Csqrt%7B63%7D%29%20%5E2%2Bx%5E2%3D12%5E2%5C%5C63%2Bx%5E2%3D144%5C%5Cx%5E2%3D81%5C%5Cx%3D9)
The equation that passes through these points is x = 4
I will help you on two conditions: 1) that you never again call yourself "stupid," and that you ask no more than 1 or 2 questions per post.
I'll focus on #5. Recall that distance = rate times time: d = r*t.
You want distance and are given rate and time: rate 1.8 km/min; time 48 min.
I see you write "distance" next to "1.8 km;" that is not correct, because
the problem states that "the rate is 1.8 km per minute." 1.8 km is a distance; 1.8 km / min is not (it's a rate).
So, again, to find the distance traveled, mult. the rate by the elapsed time:
distance = (1.8 km/min)(48 min) = 86.4 km, or about 54 miles.