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Aleks [24]
3 years ago
10

Niki scored a 78 on her first test and an 85 on her second. Niki forgot what she got on her third test bit she knows that her av

erage is an 85. What did she score on her third test? Write and sole an equation for this problem.
Mathematics
1 answer:
gregori [183]3 years ago
5 0
An average is written by the values / the amount of values.

We know there are 3 values, we know the numbers of 2, this can be modelled by the equation:

(78 + 85 + x)/3 = 85
We solve that ^:
(163+x)/3=85
163+x=255
x=92

The score on her 3rd test is 92

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Please solve Question 11 correctly..
Katena32 [7]

Answer:

i) width = 3.75

length = 4.5

ii) 6.75m^2

iii) 78.75m^2

Step-by-step explanation:

11)

i) Bedroom 1

actual width = 2.5 × 1.5

= 3.75 m

actual length = 3 × 1.5

= 4.5m

ii) Kitchen

actual width = 1.5 × 1.5

= 2.25 m

actual length = 2 × 1.5

= 3 m

actual area = 2.25× 3

= 6 .75 m^2

iii) Apartment

actual width = 5 × 1.5

= 7.5 m

actual length = 7 × 1.5

= 10. 5 m

actual area = 7.5 * 10.5

= 78.75 m ^2

5 0
3 years ago
A line passes through the point (–7, 5) and has a slope of 1/5. Which is another point that the line passes through?
ICE Princess25 [194]
<span>A line passes through the point (–7, 5) and has a slope of 1/5.
So this line would be y=1/5x+b
If we substitute x and y into this </span>formula
We can get b=5+7/5=32/5
Then y=1/5x+32/5
If x=0, then y=32/5
So another point on this line is (0,32/5)
8 0
3 years ago
Read 2 more answers
A wooden beam 24 feet long leans against a wall and makes an angle of 71° with the ground. How high up the wall does the beam re
qaws [65]
20 is the right answer because it loses 2 feet in the angle and goes two ffet back cause the angle 


4 0
3 years ago
Select the correct answer.
joja [24]

Answer:

D. 21/2

Step-by-step explanation:

We simply have to evaluate the first three terms based on the progression's formula:

t= 1,  the first term is 8, as we see:

8(\frac{1}{4})^{t-1} = 8(\frac{1}{4})^{1-1} = 8 * 1 = 8

t=2, the second term is 2, as we see:

8(\frac{1}{4})^{t-1} = 8(\frac{1}{4})^{2-1} = 8 * \frac{1}{4} = 2

t=3, the third term is 1/2, as we see:

8(\frac{1}{4})^{t-1} = 8(\frac{1}{4})^{3-1} = 8 * \frac{1}{16} = \frac{1}{2}

The sum of the first 3 terms is then: 8 + 2 + 1/2 = 10 1/2

Among the answer choices, D. 21/2, which is 10 1/2.

3 0
3 years ago
Lydia invested $8,300 in an account paying an interest rate of 2.2% compounded
Dennis_Churaev [7]

Answer:

1245

Step-by-step explanation:

5 0
2 years ago
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