David rides his bike with a constant
speed of 12 miles per hour. how long
will he take to travel a distance of
12 miles?

1 hour

Step-by-step explanation: if he travels 12 mph, it will take 1 hour to travel 12 miles.

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it