When designing the jumps of a BMX racetrack, the jumps involve a launch ramp and a landing ramp. What are some facts about the placement of these features? Check all that apply. There must be at least ten launch ramps in every course.
The slope of a launch ramp cannot be too high or too low.
The length of a landing ramp must be long enough for riders to recover from the jump, but short enough so they do not lose speed for the next jump.
There can only be one landing ramp in every course.
The slope of a ramp is found by dividing the height of the ramp by the length of the ramp

step-by-step explanation:

how many centimeters did the level of the salsa go down by?

y/x=18

step-by-step explanation:

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

step-by-step explanation: