A CD makes 58 1/2 revolutions in 3/4 min.

2 answers:

8 0

The most important thing in this problem is understanding and then dividing the given units properly. The first thing that is given is that the CD makes 58 1/2 revolutions in 3/4 minutes. We have to first simplify the number of revolutions made by the CD. This will make the problem in hand very easy.
Number of revolutions made by the CD = 58 1/2
   = 117/2
Then
The unit rate = (117/2)/(3/4)
   = (117 * 4)/(2 * 3)
   = (117 * 2)/3
   = 39 * 2
   78
So the unit rate is 78 revolutions per minute.

murzikaleks [220]3 years ago

5 0

78 revolutions per minute 58.5 I divided it by 3 to get 19.5 Then multiplied 19.5 by 4 to get the amount of rotations in a minute

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An equilateral triangle with a side length of 6mm and a height of 5.2mm is divided vertically into halves. Find the area of one

Viefleur [7K]

There are two ways you could go about solving this.

You could divide the length of the base (6mm) by 2 and use that to find the area or you could find the area of the whole triangle using 6mm and divide that by 2.

I will use the first method I described:

base = 6/2

base = 3 mm

height = 5.2 mm

area = bh/2

area = (3 * 5.2)/2

area = 7.8 square mm

(don't forget your units)

Using the other method would look like this:

area = bh/2

b = 6

h = 5.2