Answer:
9
Step-by-step explanation:
cross multiply 7/63 by 1/x
so, multiply 7 by x and 63 by 1
you get 63=7x
divide by 7 on both sides and you get 9
Answer:
2nd car is running faster than the first car by 2.01 units.
Step-by-step explanation:
Let's assume that
- the velocity of first car,
![v_1\ =\ 20i\ +\ 25j](https://tex.z-dn.net/?f=v_1%5C%20%3D%5C%2020i%5C%20%2B%5C%2025j)
- and the velocity of second car
![v_2\ =\ 30i](https://tex.z-dn.net/?f=v_2%5C%20%3D%5C%2030i)
=> speed of first car,
![u_1\ =\ \sqrt{(20)^2+(25)^2}](https://tex.z-dn.net/?f=u_1%5C%20%3D%5C%20%5Csqrt%7B%2820%29%5E2%2B%2825%29%5E2%7D)
![=\ \sqrt{400+625}](https://tex.z-dn.net/?f=%3D%5C%20%5Csqrt%7B400%2B625%7D)
![=\ \sqrt{1025}](https://tex.z-dn.net/?f=%3D%5C%20%5Csqrt%7B1025%7D)
= 32.01 units
and speed of second car,
![u_2\ =\ \sqrt{(30)^2+(0)^2}](https://tex.z-dn.net/?f=u_2%5C%20%3D%5C%20%5Csqrt%7B%2830%29%5E2%2B%280%29%5E2%7D)
= 30 units
![u_2\ -\ u_1\ =\ 32.01\ -30](https://tex.z-dn.net/?f=u_2%5C%20-%5C%20u_1%5C%20%3D%5C%2032.01%5C%20-30)
= 2.01 units
Hence, 2nd car is running faster than the first car by 2.01 units.
Answer:
x>5
Step-by-step explanation:
If f(x) is an anti-derivative of g(x), then g(x) is the derivative of f(x). Similarly, if g(x) is the anti-derivative of h(x), then h(x) must be the derivative of g(x). Therefore, h(x) must be the second derivative of f(x); this is the same as choice A.
I hope this helps.