Answer:
x > -3, x >7
Step-by-step explanation:
for -2x < 6:
first divide each side by 2: -x < 3
then divide each side by -1, so the final answer is: x > -3
(whenever you divide by a negative number you have to flip the sign)
for 4x-7>21:
first, add 7 to each side: 4x>28
then divide each side by 4, and the final answer is: x >7
Answer:
X= -7
Step-by-step explanation:
-25 + 8x +20 = -61
8x -5 = -61
8x = -56
x = -7
R = 40.5 m
C = 254.46900494077 m
A = 5152.9973500507 m<span>2</span>
Step-by-step explanation:
Let x miles/hr be the speed of the plane in still air and y miles/hr be the speed of the wind.
We have 10hr * (x + y)miles/hr = 880 miles
and 20 hr * (x - y)miles/hr = 880 miles.
=> (x + y) = 88 and (x - y) = 44.
Therefore 2x = 88 + 44 = 132 and x = 66.
The speed of the plane in still air is 66 miles per hour.