Answer:
i think its c
Step-by-step explanation:
so sorry if its wrong
Red I know because the smaller the number the bigger the fraction

- Error (e) = 50 - 42 = 8 feet
- assumed value (a) = 42 feet

_____________________________

Answer:
ft
Step-by-step explanation:
This is the formula to find satellite's escape velocity V , where R is earth's radius, h is the satellite's height from the earth surface and g is the earth's gravitational constant.
(Multiplying to clear the fractions)
(R+h)


Now, we can determine height of satellite from the surface of the earth
by putting the values in above equation

Try, please, this:
1) Imagine, that pharmacist used 'x' gr. of 40% solution and 'y' of 70% solution.
Together (20 gr. of 52% sol.) it will be x+y=20.
2) From other side, the pharmacist combined 40x and 70y gramms, after obtaining together it is 52(x+y) gramms. In other words 40x+70y=52(x+y)
3)

Answer: 8 gr. of 70% solution and 12 gr. of 40%.