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SSSSS [86.1K]
4 years ago
6

Pats final exam has 4 times the weight of her weekly exams. If she had 10 weekly exams with a weight of 1 each and an average of

92, and her overall weighted average was 88, what was her grade on the final exam?
Mathematics
2 answers:
Marta_Voda [28]4 years ago
7 0
Since the total of weight of an exam is 100 and the final exam is 4 times the weekly exam  
X + 4x = 100 %
5x = 100 %
X = 20%
4x = 80%  


Weighted ave = 0.2( ave weekly exam) + 0.8(final exam 88 = 0.2(92) + 0.8(final exam)
Solve for the final exam
<span>Final exam = 87</span>
Firlakuza [10]4 years ago
6 0

Answer: 78

Step-by-step explanation: For the weekly exams, we have  x /10  = 92, x = 920. Assume that the final score is y with weight 4. Since the overall weighted average is the sum of the weighted scores divided by the sum of the weights, then  920 + 4y  / 14  = 88, 920 + 4y = 1232, 4y = 312, y = 78.

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the ratio of the length to the width of a rectangle is 8:3 if the rectangle is 32 cm wide, how long is it?
Charra [1.4K]

I think it's;

Ratio of areas = 8:3

Wideness of the the shape = 32 cm

8:3 = 32:X

8/3 = 32/x

x = 8*3/32

= 0.75

Not too sure about the answer

7 0
4 years ago
What is the period of the graph of the equation y = a sin bx?
steposvetlana [31]

T=2π/|b|. The period of an equation of the form y = a sin bx is T=2π/|b|.

In mathematics the curve that graphically represents the sine function and also that function itself is called sinusoid or sinusoid. It is a curve that describes a repetitive and smooth oscillation. It can be represented as y(x) = a sin (ωx+φ) where a is the amplitude, ω is the angular velocity with ω=2πf, (ωx+φ) is the oscillation phase, and φ the initial phase.

The period T of the sin function is T=1/f, from the equation ω=2πf we can clear f and substitute in T=1/f.

f=ω/2π

Substituting in T=1/f:

T=1/ω/2π -------> T = 2π/ω

For the example y = a sin bx, we have that a is the amplitude, b is ω and the initial phase φ = 0. So, we have that the period T of the function a sin bx is:

T=2π/|b|

7 0
3 years ago
Take a look at the picture and answer correctly so i can mark you as brainliest.
AVprozaik [17]

Answer:

{-5, -4, -2, -1, 2, 3}

Step-by-step explanation:

Domain is x value and then you have to put in order :)

5 0
3 years ago
Read 2 more answers
00:00
Furkat [3]

Answer:

-2

Step-by-step explanation:

Subtracting a negative number is the same as adding it, so this is basically just negative 8 plus 6, which is -2. Don't know who was right though, you kinda left that part of the question out.

5 0
4 years ago
Which relation Is a function? From the graphs ​
kicyunya [14]

Answer:

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Step-by-step explanation:

because it's close

5 0
4 years ago
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