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Answer:
a = 2/3
Step-by-step explanation:
(4(x+1) + 20 )/(x+1) = 16
4x + 4 + 20 = 16x + 16
12x = 8
x = 2/3
Answer: 5x+16
Step-by-step explanation:
Distribute
2x+12 + 3x + 4
Add like terms
5x+16
His average speed for the first trip is 43 mph
Since Brian's average speed is x and he travels the first part for 215 miles in time t.
So, his distance d = xt
Also, the travels 75 more miles at a speed of 15 mph.
Since distance = speed time, the time he takes to cover this distance is
t' = distance/speed = 75 mi/15 mph = 5 hours
Since he covers both distances in the same time, we have that t = t' = 5 hours.
So, his average speed for the first trip x = d/t
= 215 mi/5 h
= 43 mph
His average speed for the first trip is 43 mph
Learn more about average speed here:
brainly.com/question/13605708
Answer:
Step-by-step explanation:
Subtract 1 from both sides
Simplify
Multiply both sides by -1, which reverses the inequality also
Simplify
Multiply both sides by 5
Simplify