Suppose 42 stamps are added to a stamp collection that has 30 stamps. what is the percent of change? round your answer to the nearest tenth, if necessary.

The percentage change in the number of stamps is 140%.

Step-by-step explanation:

We are given the following information in the question:

Number of stamps added = 42

Initial number of stamps = 30

Total umber of stamps = 72

Formula:

Percentage change =

Putting the values, we have:

Hence, the percentage change is 140%.

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