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Dovator [93]
3 years ago
11

Could someone help me on 6 7 and 8? So confused!!!!

Mathematics
1 answer:
Radda [10]3 years ago
5 0
7. We know that they must all add up together to get 90 degrees because of the symbol show the right angle. 
We can use this to form and solve an equation:
2x +1x + 30 = 90
3x+30 = 90  (add the x's together)
3x = 60    (subtract both sides by 30 to get the x's alone)
x =20  (divide by 3 to get what 1x is equal to)

(The next question is very similar)
8. To solve this, we need to know what all the x's together are equal to.
Since angles on a straight line add up to 180 degrees -we can make an equation:
4x+x+30 = 180 
5x + 30 +180  (add all the x's together)
5x = 150  (subtract both sides by 30 to get what 5x is equal to)
x = 30 (divide by 5 to get what just 1x is)

Hoped this helped - please ask if anything doesn't make sense!
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Answer:

  b. y-y1 = m(x-x1)

Step-by-step explanation:

It's a matter of definition. There are perhaps a dozen useful forms of equations for a line. Each has its own name (and use). Here are some of them.

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Adding y1 to the point-slope form puts it in an alternate form that is useful for getting to slope-intercept form faster: y = m(x -x1) +y1. I use this when asked to write the equation of a line with given slope through a point, with the result in slope-intercept form.

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3 years ago
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You have 132 m of fencing with which to make 2 side by side rectangular enclosures against an existing wall. If the enclosures a
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The two enclosures will need three equal fences coming out from the wall and meeting another fence running parallel to the wall. If the fences coming out from the wall are x metres long the parallel fence will be (132 - 3x) metres long.
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The derivative of A = zero when 132 - 6x = 0 which means the maximum area is when x = 22m
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If you don’t know how to find derivatives then you could sketch the graph of y = x(132 - 3x).
This is an inverted parabola (hill) with x intercepts at 0 and 132/3 = 44.
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Try any other value for x and the area will be smaller.
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2 years ago
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3 years ago
Linda ran 2 mile in 1/3 hour. How many <br> miles did she run in one hour?
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