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mrs_skeptik [129]
3 years ago
8

!!MATH GENIUSES HELP ME!!

Mathematics
1 answer:
seraphim [82]3 years ago
8 0

Answer:

D

Step-by-step explanation:

Let x be Bill’s scores.

Let y be Theo’s scores.

x + y = 90

x² = y

Solve for x in the second equation.

x = √y

Put x as √y in the first equation and solve for y.

√y + y = 90

√y = 90 - y

y = (90 - y)²

y = - y² - 180y - 8100

0 = -y² - 181y - 8100

0 = (-y+81)(y-100)

-y+81=0

y = 81

y - 100 = 0

y = 100

100 does not work if we plug in to check, so y is 81.

y = 81

Put y as 81 in the first equation and solve for x.

x + 81 = 90

x = 9

Bill scored 9 goals and Theo scored 81.

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If p is directly proportional to q, and p=9 when q=7.5, find q when p=24.
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<h3>Solution and Explanation:</h3>

If p and q are directly proportional, then they must have a common scalar.

To find q we must first find its scalar. If we let a be the scalar we can form the equation, ap = q.

We are given the information that if q = 7.5 then p = 9. We can use that in finding the scalar.

a \times 9 = 7.5 \\ \frac{a \times 9}{9} = \frac{7.5}{9} \\ a = \frac{75}{90} \\ a = \frac{15}{18}

Now we can solve for q when p = 24 knowing that our scalar is \frac{15}{18}\\.

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<h3>Answer:</h3>

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