Jessica needs to get her bicycle fixed. A mechanic charges $30 per hour of labor, and $45 for parts. The total cost for fixing Jessica's bicycle is $90. How long did it take the mechanic to fix Jessica's bicycle?

7

Step-by-step explanation:

It took the mechanic an hour and a half so 1.5 hour.

Step-by-step explanation:

If the mechanic charges $30 per hour + $45 for parts=75. If the total cost was $90 then 90(total cost)-75(for the first hour +parts) =15 and 30(cost of one hour)/2 is 15 which is half hour.

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.