w = 37.846 mph (wind rate)
plane speed in still air: 492 mph
Step-by-step explanation:

42/(-3 * -2)
Multiply the -3 and -2
42/6
Devise
Answer is 7
The answer is A. 4
in this equation you use pythagoreans theorem
x^2-8^2=9^2
x^2-64=81
81-64=17
square x^2 square 17
x=4.12 rounded to 4
Ok... so this question can be solved by using simultaneous equations.
Use the general from of a parabola

you know the value of c, the y-intercept... y = -4
which means the equation is

now use the other 2 points to get 2 equations in 2 unknowns
(-2, -20) just substitute

this becomes

now the other equation using (4, -20)
The simplified form is