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Iteru [2.4K]
3 years ago
6

A baseball team won 40% of its first 30 games. The team then won 65% of its next 60 games. Approximately what percent of the gam

es did the team win?
A. 47
B. 51
c. 53
D. 57
Mathematics
1 answer:
ozzi3 years ago
3 0

Answer:

B. 51

Step-by-step explanation:

To find the answer, you need to multiply the percentage by the number of total games. To multiply the percentage, you need to transform it into a decimal. To do that, simply move the decimal in 40 two spaces to the left. Now you have 0.4. multiply 0.4*30=12. So out of 30, the team won 12 games. Do the same thing with 65% of 60 games. 0.65*60=39. So out of 60, the team won 39. Add the amount of games won total to get 51. Remember the technique in bold! Hope this Helps!

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What is the perimeter of △ABC?
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<h3>Given</h3>
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<h3>Find</h3>
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<h3>Solution</h3>

The perimeter of a triangle is the sum of the lengths of its sides. The length of each side can be found using the Pythagorean theorem. Effectively, each pair of points is treated as the end-points of the hypotenuse of a right triangle with legs parallel to the x- and y-axes. The leg lengths are the differences betweeen the x- and y- coordinates of the points.

The difference of the x-coordinates of segment AB are 0-(-3) = 3. The y-coordinate difference is 3-(-1) = 4. So, the leg lengths of the right triangle whose hypotenuse is segment AB are 3 and 4. The Pythagorean theorem tells us

... AB² = 3² +4² = 9 +16 = 25

... AB = √25 = 5

You may recognize this as the 3-4-5 triangle often introduced as one of the first ones you play with when you learn the Pythagorean theorem.

LIkewise, segment AC has coordinate differences of ...

... C - A = (1, 2) -(-3, -1) = (4, 3)

These are the same leg lengths (in the other order) as for segment AB, so its length is also 5.

Segment BC has coordinate differences ...

... C - B = (1, 2) -(0, 3) = (1, -1)

The length of the line segment is figured as the root of the sum of squares, even though one of the coordinate differences is negative. The leg lengths of the right triangle used for finding the length of BC are the absolute value of these differences, or 1 and 1. Then the length BC is

... BC = √(1² +1²) = √2 ≈ 1.4

So the perimeter of the triangle ABC is

... AB + BC + AC = 5 + 1.4 + 5 = 11.4 . . . . perimeter of ∆ABC in units

_____

Please be aware that the advice to "round each step" is <em>bad advice,</em> in general. For real-world math problems, you only round the final result. You always carry at least enough precision in the numbers to ensure that there will not be any error in the final rounding.

In this problem, the only number that is not an integer is √2, so it doesn't really matter.

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