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Anna35 [415]
3 years ago
6

Sarah will take 8 algebra tests. On the first 7, Sarah's scores were 79, 86, 92, 89, 87, 80, and 82. What will Sarah need to sco

re on the 8th test to have an average grade of 86?
Mathematics
1 answer:
jenyasd209 [6]3 years ago
6 0

Answer:

Step-by-step explanation:

Let represent the score on Sarah's last test.

The average of her 8 test scores is 86.

This means:

(79+86+92+89+87+80+82+x)/8 =86

595+x=688

x=93

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katrin2010 [14]
The best answer is C : The sum of the measures of two angles os 180 degrees . 

7 0
3 years ago
3.
sergey [27]

Answer:

His money earned $36 after 3 months

Step-by-step explanation:

* Lets revise the rules of simple interest

- Simple Interest Equation (Principal + Interest)

 A = P(1 + rt)

- Where:

• A = Total amount (principal + interest)  future amount

• P = Principal Amount

• I = Interest Amount

• r = Rate of Interest per year in decimal; r = R/100

• t = Time Period involved  

* To calculate the interest I use the formula

  I = P × r × t

* Lets solve the problem

- The rate is annual

- The interest calculated after 3 months

∴ I = P × R/100 × t/12

∵ P = $3600.00

∵ R = 4%

∵ t = 3 month

∴ I = 3600.00 × 4/100 × 3/12 = $36

* His money earned $36 after 3 months

5 0
3 years ago
Solve the system of linear equations.
icang [17]

Answer: The set does not have a solution

Step-by-step explanation:

Adding Equations 1 & 3 we get 5x = 7. This gives x = 7/5

Putting this value of x in eq. 2 we get

-2y + 2z = -1-(7/5) or

2y - 2z = 12/5  or  5y - 5z = 6

Multiplying eq. 1 by 2  we get  

4x + 2y - 2z = 6

adding this with eq. 2 we get 5x = 5 or x = 1

As the common solution for x from equations 1&3 does not satisfy eq. 1&2 it comes out that the three equations do not have a common solution.

Same can be verified by using different sets of two equations also.

7 0
3 years ago
I need help with my algerbra
Molodets [167]
I can help you what problem??
5 0
3 years ago
A huge ice cream sundae is made for a charity. It contains about 6,900 pounds of topping. The topping flavors are chocolate, but
Dennis_Churaev [7]

Answer:

7500 pounds of toppings

Step-by-step explanation:

6,900 + 600=

3 0
3 years ago
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