Answer:
8(x+9)=7
comment if you need anything else like solving for x
Speed is distance over time
miles per hour is distance over time
so if it averaged 420 miles an hour
is it not 420 miles per hour?
perhaps i am misunderstanding something?
Answer:
x = 12
Step-by-step explanation:
the two equations shown should add up to 180. so I did this equation: (10x-20)+ (6x+8) = 180 and I solved for x
The roller coaster starts at ground level.
Start: ground level, 0 ft altitude.
Climbs 110 ft: now it is at 0 ft + 110 ft = 110 ft altitude
Drops 65 ft: now it is at 110 ft - 65 ft = 45 ft altitude
Climbs 135 ft: now it is at 45 ft + 135 ft = 180 ft altitude
Since after the last step it is at 180 ft altitude, for the altitude to go back to 0, you must do 180 ft - 180 ft since 180 ft - 180 ft = 0 ft, ground level. The -180ft (the subtraction of 180 ft) part is a 180 ft drop. Therefore, the roller coaster needs to drop 180 ft to get back to ground level.
