A weather station reported 90% of the days in a 30-day period had measurable snowfall. How many of these days received measurable snowfall?

27 days.

Step-by-step explanation:

Find 1% out of the 30-day period.

100% = 30 days

1% = 30 ÷ 100 = 0.30

Now find the percentage reported that had measurable snowfall which is 90%.

90% = 0.30 x 90 = 27

Out of the 30-day period, only 27 days received measurable snow.

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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