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Anestetic [448]
3 years ago
8

Please help me out!!!!!!!!

Mathematics
1 answer:
qaws [65]3 years ago
5 0

Answer:

x = - 6

Step-by-step explanation:

Given that y varies directly as x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = - 9 when x = 3, thus

k = \frac{y}{x} = \frac{-9}{3} = - 3

y = - 3x ← equation of variation

When y = 18, then

18 = - 3x ( divide both sides by - 3 )

x = - 6

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Maya bought 3 CDs that were each the same price. Including sales tax, she paid a total of $ 47.70 . Each CD had a tax of $ 1.10
Leni [432]

47.70- 3.30=44.40

44.40/ 3=14.80

each cd cost 14.80

5 0
3 years ago
Which function represents the relationship between x and y when y=16/5 and x=20 ​
STatiana [176]

Answer:

y = (4/25)x

Step-by-step explanation:

We are given;

y = 16/5 and x = 20

Now if y varies directly with x, then we can say;

y = mx

Where m is constant of proportionality

This means that;

16/5 = 20m

Divide both sides by 20 to get;

(16/5) × 1/20 = m

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6 0
3 years ago
Please help me out with this!
bezimeni [28]

Answer:

20

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
Suppose the path of a baseball follows the path graphed by the quadratic function ƒ(d) = –0.6d2 + 5.4d + 0.8 where d is the hori
Vinil7 [7]

Answer:


Domain is all real numbers


Range is


y\le 12.95



Step-by-step explanation:


The given function is


f(d)=-0.6d^2+5.4d+0.8


This is a maximum quadratic function therefore the domain is all real numbers.


Let us complete the square to find the vertex.



f(d)=-0.6(d^2-9d)+0.8



f(d)=-0.6(d^2+9d)+-0.6(\frac{9}{2})^2- -0.6(\frac{9}{2})^2+ 0.8




f(d)=-0.6(d-\frac{9}{2})^2+\frac{243}{20}+ 0.8





f(d)=-0.6(d-\frac{9}{2})^2+\frac{259}{20}






Therefore the range is




y\le \frac{259}{20}



y\le 12.95


See graph




5 0
3 years ago
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A line passes through the point(5,-6) and has a slope of -2 .
pishuonlain [190]

Answer:

Possible answers (6,-8) and (4,-4)

Step-by-step explanation:

These two possible answers show the line has a slope of -2

8 0
2 years ago
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