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allochka39001 [22]
3 years ago
5

Tickets prices for a science museum are $18 for adults and $12 for students. If $162 is collected from a group of 12 people, how

many adults and students are in a group?
Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
6 0
X=number of adults, y= number of students

x+y=12
18x+12y=162

You can simplify the second equation by dividing by six: 3x+2y=27
Rearrange the first equation: y= 12-x. Plug y into the simplified second equation:

3x+2(12-x)=27
3x-2x+24=27
x=3.

Plug the now known x value into y=12-x. So y= 9.
Therefore, there are 3 adults and 9 students.

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If you spin the spinner 24 times, what is the best prediction possible for the number of times it will land on pink?
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6 times

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nlexa [21]

Answer:

  • -108.26
  • -108.13
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Step-by-step explanation:

A graphing calculator or spreadsheet is useful for making the repeated function evaluations required.

The average velocity on the interval [a,b] will be ...

  v avg = (y(b) - y(a))/(b-a)

Here, all the intervals start at a=3, so the average velocity for the given values of t will be ...

  v avg = (y(3+t) -y(3))/((3+t) -3) = (y(3+t) -y(3))/t

This can be computed for each of the t-values given. The results are shown in the attached table.

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We note that the fractional part of the velocity gets smaller in proportion to t getting smaller. We expect it to go to 0 when t goes to 0.

The estimated instantaneous velocity is -108 ft/s.

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We can simplify the average velocity equation to ...

  v avg = ((48(3+t) -26(t+3)^2) -(48(t+3) -26(3)^2)) / t

  = (48t -26(t^2 +6t))/t

  = 48 -26t -156

<em>   v avg = -108 -26t</em>

Then the average velocity at t=0 is -108.

5 0
3 years ago
identify an equation in point slope form for the line perpendicular to y=-2x+8 that passes through (-3,9)
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Answer:

y - 9 = 1/2(x + 3)

Step-by-step explanation:

find the slope that is perpendicular to line y = -2x + 8, which is the negative reciprocal slope: 1/2

substitute the new slope 1/2 and the given/known point (-3, 9) into the point-slope form:

=> y - 9 = 1/2(x - (-3)) => y - 9 = 1/2(x + 3)

point-slope form:

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3 years ago
Please help me solve this geometry problem:)
yarga [219]

Given:

The endpoints of a line segment are (-5,12) and (-5,0).

To find:

The coordinates of a points which divides the line segment in 2:1.

Solution:

Section formula: If a point divides a line segment in m:n.

Point=\left(\dfrac{mx_2+nx_1}{m+n},\dfrac{my_2+ny_1}{m+n}\right)

Let point P divides the given line segment in 2:1. They, by using section formula, we get

P=\left(\dfrac{2(-5)+1(-5)}{2+1},\dfrac{2(0)+1(12)}{2+1}\right)

P=\left(\dfrac{-10-5}{3},\dfrac{0+12}{3}\right)

P=\left(\dfrac{-15}{3},\dfrac{12}{3}\right)

P=\left(-5,4\right)

Therefore, the coordinate of the point that partitions the given segment in the ratio 2:1 are (-5,4).

8 0
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