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Mars2501 [29]
2 years ago
14

If Jan can buy 12 copies of a certain book $40, what is the unit rate for cost per copy? How much would it cost her to buy 18 co

pies at the same rate?
Mathematics
2 answers:
goldfiish [28.3K]2 years ago
7 0
40/12=3.33
3.33x18= 59.94
crimeas [40]2 years ago
3 0
3.33 since we know 12 is for 40 we can set up an equation
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Vsevolod [243]

Answer:

19

Step-by-step explanation:

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(3x - 5) + 90 + 2x = 180

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3 years ago
CD is perpendicular to AB and passes through point C5, 12).
Aleksandr-060686 [28]

Answer:

x intercept of CD = 17

Step-by-step explanation:

We are given a line AB with its end coordinates. and Another line segment CD which is perpendicular to AB. We have the coordinates of C , and we are asked to find the x intercept of line CD.

For that we need to find the equation of CD

we have coordinates of C , and hence if we have slope of CD we can find equation of CD

Slope of CD can be determine with the help of slope of AB as CD⊥ AB

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Hence we start from determining slope of AB

slope is given as

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(∵  Product of Slopes of two perpendicular lines is always -1)

Now we find the equation of CD with the help of slope -1 and coordinates of C(5,12)

m=\frac{y-y_1}{x-x_1}

-1=\frac{y-12}{x-5}

-x+5=y-12

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0=-x+17

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8 0
3 years ago
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stiks02 [169]

Answer:

Pythagorean Theorem: c2 = a2 + b2

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2 years ago
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