There are 90 total days in winter. If it snowed on 30% of the days, on how many days of winter did it snow?

27

Step-by-step explanation:

30%=0.3 in decimal form

90×0.3=27

27 days

Step-by-step explanation:

Well, there's two ways we could do this (which I do). One way is easier with a calculator, one is useful when you cannot use a calculator.

EASY CALCULATOR METHOD

30% as a decimal is 0.3, so if you multiply 90 by 0.3, you can easily find 30%. So:

90 x 0.3 = 27 days.

NON CALCULATOR METHOD

To find 10% of something, we divide the original value by 10. Therefore, we just need to find 10% and multiply that value by 3 to get 30%. So:

90/10 = 9 days (10%)

9 x 3 = 27 days (30%)

Either way both give you the same answer of 27 days.

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explanation

the graph has a slope of 1/3 because each time you move up 1, you go to the right 3. so, slope = rise/run = 1/3. we can cross choice a off the list since we want a slope of 3, rather than 1/3.

the first table shown has a slope of -3. this is because the rise is -6 and the run is 2, so slope = rise/run = -6/2 = -3. note how x increases by 2 each time (run) and y drops by 6 each time (rise). choice b can be eliminated.

the second table has a slope of 3. each time x goes up by 1, the y values increase by 3. slope = rise/run = 3/1 = 3. alternatively you can use the slope formula to prove that the slope is 3 here. use any two rows of values to generate the two points. choice c is one of the answers

the third table also has a slope of 3. let's use the slope formula to prove as such. i'm going to use the first two rows of the table. so i'll use the two points (2,1) and (5,10)

m = slope

m = (y2-y1)/(x2-x1)

m = (10-1)/(5-2)

m = 9/3

m = 3 so we get a slope of 3

choice d is the other answer