Answer:
(-infinity, 0)
(0, 4]
[30, infinity)
Step-by-step explanation:
The inequality seems a little weird since it doesn't reflect the formula for speed accurately. The right inequality should be:
average speed >= 24
(first half speed + second half speed)/2 >= 24
(x+ (x-10))/2 >= 24
x-5>=24
x>= 29
In this case, the answer should be only [30, infinity)
If I solve the inequality given by the problems, the result will be:
1/x + 1/ (x-10) >= 2/24 ---> multiply both side with x(x-10)
x-10 + x >= (2x^2-20x)/24 ---> move /24 to left side
48x-240 >= 2x^2-20x ---> move all left side to right side
0>=2x^2 -68x+240 ---> divide both side by 2
0>=x^2 - 34x +120
0>=x^2-30x -4x+120
x(x-30) -4 (x-30)
(x-4) (x-30)
x1=4 x2=30
Since the coefficient of x^2 is positive so only area between two result is negative.
The answer will be
x1= (-infinity, 4]
x1= (-infinity, 0) , (0, 4]
x2= [30, infinity)
1. A and 2 is y=10x+0.10x
X represents the charge per month and also for each text message
Surface area is the area around the rectangular prism. To find the surface area, you have to find the area of each individual side and get the sum or follow this formula:2WL+2LH+2WH.L stands for length, W stands for width, and H stands for height. The answer is 2000.
Rules for adding: if the bases are the same you can add them, and subtracting happens in a fraction
