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drek231 [11]
3 years ago
6

If your chemistry grade is broken down so that 70% of it is exams, 20% is a lab, and 10% is homework, and your average scores ou

t of 100 points in each area are:
exams 85
labs 75
homework 96
Calculate your weighted average.
Mathematics
1 answer:
vodomira [7]3 years ago
6 0
84.1

(85 x 0.7) + (75 x 0.2) + (96 x 0.1) = 84.1
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An electrician charges $35 per hour plus a fixed amount for residential work. For a job that took 6 hours, he billed $270. Write
Alexeev081 [22]
With the information provided, we can begin with the equation:

y=35x + b

With x = number of hours, y = total cost, b = fixed amount that is charged for residential work

We know that after 6 hours, $270 was charged:

$270 = $35(6) + b

Solve for b:

b = $270 - $210 = $60

The fixed amount that is charged for residential work is $60. So now we can rewrite the equation as:

y = 35x + 60
7 0
2 years ago
7.37×10 with an exponent of nine
Harman [31]

Answer:

We get 6 x10^7 with a 4dp of 9599

 9599

  /     \

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Step-by-step explanation:

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2 years ago
3. Is XY Tangent to circle Z?<br> Y<br> 12 X<br> (20<br> Z<br> 18
Ratling [72]

Answer:

XY is a tangent

Step-by-step explanation:

Given

XY = 12

WY = 20

WZ = 8

Required

Is XY a tangent?

XY is a tangent if:

WY^2 = XY^2 + WX^2

Because XY should make a right angle at point X with the circle

Where

WX = 2 * WZ

So, we have:

WY^2 = XY^2 + WX^2

WY^2 = XY^2 + (2*WZ)^2

WY^2 = XY^2 + (2WZ)^2

WY^2 = XY^2 + 4WZ^2

This gives:

20^2 = 12^2 + 4*8^2

400 = 144 + 256

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<em>Yes, XY is a tangent</em>

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2 years ago
Is this a 3-4th fraction
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Answer:

The clock hand made a 90 degree turn. It is not a 3/4 fraction.

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3 years ago
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iren2701 [21]
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