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zepelin [54]
3 years ago
11

Laura is mailing 10 letters and 10 postcards. Letters cost 39 cents each and postcards cost 24 cents each. Which expression belo

w could be used to find the total cost for this mailing?
A. (10)(0.24)(0.39)
B. (10)(0.24)+0.39
C. (10)(0.24+0.39)
D. 20(0.39+0.24)
Mathematics
2 answers:
viktelen [127]3 years ago
6 0
The answer would be the letter C
frutty [35]3 years ago
3 0
The expression below to find the total cost for this mailing is C. (10)(0.24+0.39)
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Can someone help me with the first question please
snow_lady [41]

Answer:

  (c)  5y -17x +99 = 0

Step-by-step explanation:

The median of a triangle is the line through a vertex and the midpoint of the opposite side. The median of ΔXYZ from vertex Y will be the line through point Y and the midpoint of XZ.

<h3>Midpoint</h3>

The midpoint of XZ is the average of the coordinates of X and Z.

  M = (X +Z)/2

  M = ((1, -2) +(8, -7))/2 = (9, -9)/2 = (4.5, -4.5)

<h3>Line through two points</h3>

The slope of the median can be found using the slope formula:

  m = (y2 -y1)/(x2 -x1)

The slope of line YM is ...

  m = (-4.5 -4)/(4.5 -7) = -8.5/-2.5 = 17/5

The point-slope form of the equation of a line is ...

  y -k = m(x -h) . . . . . . line with slope m through point (h, k)

The line with slope 17/5 through point Y(7, 4) is ...

  y -4 = 17/5(x -7)

Subtracting the right side, and multiplying by 5 gives ...

  5(y -4) -17(x -7) = 0

  5y -17x +99 = 0 . . . . equation of the median through Y

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2 years ago
If the point (3/5 , 4/5) corresponds to an angle 0 in the unit circle, what is the tan 0?
Ira Lisetskai [31]

Given the circumstances, a triangle can be drawn on a circle where the hypothenuse is 5, the leg going right is 4, and the amount going up is 3 (Try visualizing it). Knowing that tangent is opposite over adjacent of theta, tangent would be 3/4
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A hemisphere (a half sphere) has a diameter of 10 centimeters. Find the
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Answer:

v= 261.79 = 261.8

I believe this is right

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3 years ago
2/3x - 9= 3/4<br> Find x 1/5x + 8= 3/4 Find x
mojhsa [17]
\frac{2}{3}x-9=\frac{3}{4}\ \ \ \ |multiply\ both\ sides\ by\ LCM(3;4)=12\\\\12\cdot\frac{2}{3}x-12\cdot9=12\cdot\frac{3}{4}\\\\4\cdot2x-108=3\cdot3\\\\8x-108=9\ \ \ \ |add\ 108\ to\ both\ sides\\\\8x=117\ \ \ \ |diviede\ both\ sides\ by\ 8\\\\x=\frac{117}{8}\\\\\boxed{x=14\frac{5}{8}}



\frac{1}{5}x+8=\frac{3}{4}\ \ |other\ method\ like\ first\ . . . . |subtract\ 8\ from\ both\ sides\\\\\frac{1}{5}x=\frac{3}{4}-8\\\\\frac{1}{5}x=\frac{3}{4}-\frac{4\cdot8}{4}\\\\\frac{1}{5}x=\frac{3}{4}-\frac{32}{4}\\\\\frac{1}{5}x=-\frac{29}{4}\ \ \ \ |divide\ both\ sides\ by\ \frac{1}{5}\to(multiply\ both\ sides\ by\ 5)\\\\x=-\frac{29}{4}\cdot\frac{5}{1}\\\\x=-\frac{145}{4}\\\\\boxed{x=-36\frac{1}{4}}
4 0
3 years ago
(11.10). 6 = 6. (1110)<br> O<br> A. True<br> O<br> B. False
Yuri [45]

Answer:

false

Step-by-step explanation:

3 0
3 years ago
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