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3 years ago

If y varies directly as x, and y = 36 as x = 9, find y for the x-value 5

1 answer:

6 0

Y varies directly as x means this equation : y=kx

given y=36 and x=9, plug it into the equation to find k
36 = 9k, so k=?
k=4

so now you have your equation y=4x
and you're trying to find y given x=5
so
y= 4(5) so y=?

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A water hose had filled up 1/9 of a pool after

OleMash [197]

Answer:

x=2.25hrs

Step-by-step explanation:

1/9 =1/4hr

9/9=x

(9/9)/(1/9)=1/4.xhr

1/9=1/4.xhr

cross multiplying

4x=9

x=9/4

x=2.25hrs

6 0

3 years ago

Find the perimeter of the following isosceles triangle. show work

julsineya [31]

Answer

Find out the perimeter of the isosceles triangle.

To prove

As shown in the figure.

P(0,4) , Q(-2,0) and R(2,0) are the vertices of the triangle PQR.

Formula

$Distance\ formula = \sqrt{(x_{2} - x_{1})^{2} +(y_{2} -y_{1})^{2}}$

As P(0,4) and Q(-2,0)

$PQ = \sqrt{(-2 - 0)^{2} +(0 - 4)^{2}}$

$PQ = \sqrt{4+16}$

$PQ = \sqrt{20}\unit$

In the isoceles triangle the two sides of the triangles are equal .

Therefore PQ = PR

$PR = \sqrt{20}\unit$

As Q(-2,0) and R(2,0)

$QR = \sqrt{(2- (-2))^{2} +(0 - 0)^{2}}$

$QR = \sqrt{(4)^{2}}$

QR = 16 unit

$Perimeter\ of\ triangle PQR = \sqrt{20} +\sqrt{20} + 16$

$Perimeter\ of\ triangle PQR = 4\sqrt{5} + 16\ units^{2}$

3 0

3 years ago

Help please ASAP

Nat2105 [25]

41. A

42. A

43. B

44. B

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46. A

47. B

48. A

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3 years ago

Alex skateboards at a constant speed from his house to school 3.8 miles away. It takes him 18 minutes. What fraction represents

Paraphin [41]

Speed is expressed as the ratio of distance/time = d/t

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. . . or simply

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3 years ago

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zlopas [31]

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3 years ago