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VikaD [51]
2 years ago
4

Going into the final exam, which will count as two tests, Brooke has test scores of 79, 82, 74, 59, and 96. What score

Mathematics
1 answer:
SashulF [63]2 years ago
4 0

Let the score she needs be x.

\frac{79+82+74+59+96+2x}{7}=80 \\ \\ 79+82+74+59+96+2x=560 \\ \\ 2x=170 \\ \\ \boxed{x=85}

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Music Co charges a fee of $20 a month plus $1 per song Jams charges no monthly fee but $3 per song. How many songs would have to
NeTakaya

Answer:

10 songs

Step-by-step explanation:

20 + 1x = 3x

20 = 2x

10 = x

—

20 + 1(10) = 3(10)

20 + 10 = 30

30 = 30

4 0
3 years ago
A carton contains soup can weighing a total of 20 pounds each can weighs 1 1/4 pounds how many cans does the carton contain
Pani-rosa [81]


do 20 divide 5/4 (=1 1/4)

so 20 * 4/5 which would be 80/5; simplifies to 16 cans

7 0
3 years ago
If 2 liters of sea water contain 70 grams of salt, how much salt is in 32 liters of seawater?
Liono4ka [1.6K]

Answer:

There is 1,120 grams of salt in 32 liters of seawater.

Step-by-step explanation:

32 / 2 = 16

16 * 70 = 1,120

<3

8 0
3 years ago
PLEASE HELP WILL GIVE BRAINLIEST AND 30 POINTS!!!!!
garik1379 [7]

Answer:

Step-by-step explanation:

If the price is supposed to be dropping with each year, maybe your year/price chart would reflect that. Seems to me that the price rose between 2015 and 2016 and even by 2017 the value was still higher than it was in 2015.

I have no way of knowing how to fix this.

Let's ASSUME that the 2015 price was $71,445 and that the 2016 and 2017 prices are valid.

the decrease between 2015 and 2016 is (71445 - 68640) / 71445 = 0.03926

or 3.926%

the decrease between 2016 and 2017 is (68640 - 65945)/68640 = 0.03926

or 3.926%

so the price each year after new is

p = 71445(1 - 0.03926)ⁿ

or

71445(0.96074)ⁿ

where n is the number of years.

To get the monthly version, we divide the decrease by 12

p = 71445(1 - 0.03926/12)ˣ

or

p = 71445(1 - 0.00327)ˣ

or

p = 71445(0.99673)ˣ

where x is the number of months since new.

This may not be your exact answer, but the same method can be used if you get real numbers.

8 0
3 years ago
Which are the solutions of the quadratic equation x^2=-5x-3
frutty [35]
The correct answer would be \frac{-5 +/-  \sqrt{13} }{2}

In order to solve for this you must first get the equation equal to 0. 

<span>x^2=-5x-3 ----> add 5x to both sides. 
x^2 + 5x = -3 ----> add 3 to both sides.
x^2 + 5x + 3 = 0

Now knowing this we can use the coefficients of each one in descending order of power as a, b and c. 

a = 1 (because it is the coefficient to x^2)
b = 5</span> (because it is the coefficient to x)
c = 3 (because it is the end number)

Now we can plug these values into the quadratic equation. 

\frac{-b +/-  \sqrt{b^{2} - 4ac } }{2a}

\frac{-5 +/- \sqrt{5^{2} - 4(3)(1) } }{2(1)}

\frac{-5 +/- \sqrt{13} }{2}

And those would be your two answers.
5 0
3 years ago
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