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Anastasy [175]
3 years ago
14

Math 8 Unit 8 lesson 1-5

Mathematics
1 answer:
patriot [66]3 years ago
8 0

Can you please comment the questions, we don't know what to do.

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Ted needs an average of at least 70 on his three history tests. He has already scored 85 and 60 on two tests. What is the minimu
taurus [48]
To find the mean you must add up all the numbers and divide by how many there are:
35 + 60 + x
_________  =    70
        3

35 + 60 + x = 210

x = 65

He must score at least a 65 for a 70 average.
6 0
3 years ago
Read 2 more answers
What is the solution to this system of equations?
77julia77 [94]

Answer:

(x,y) = (3, 1/2)

Step-by-step explanation:

This pair of linear equations may be solved simultaneously by using the elimination method. This will involve ensuring that the coefficient of one of the unknown variables is the same in both equations..

To solve this, add the equations;

x + 2x + 2y - 2y = 4 + 5

3x = 9

x = 3

substitute the value of x into the first equation,

3 + 2y = 4

2y = 4 -3

2y = 1

y = 1/2

6 0
3 years ago
HELP PRETTY PLEASE ILL GIVE BRAINLIEST<br> 150% of x is 216. What is x?
Katarina [22]
Answer:
x=144

Step by step:

150% • x = 216

216•100/150

x=144
7 0
2 years ago
One month Donna rented 5 movies and 6 video games for a total of $48. The next month she rented 3 movies and 2 video games for a
faltersainse [42]

Answer:

Cost for each movie: $1.50 Cost for each video game: $6.75

Step-by-step explanation:

Let x be the cost (in dollars) of renting a movie.

Let y be the cost (in dollars) of renting a video game.

The total cost of renting 3 movies and 2 video games is +3x2y dollars.

We're given that this total cost is $18, so we have =+3x2y18.

The total cost of renting 5 movies and 6 video games is +5x6y dollars.

We're given that this total cost is $48, so we have =+5x6y48.

Therefore, we get the following system of equations.

=+3x2y18

=+5x6y48

Multiplying the first equation by −3 and adding gives us the following.

   −9 x− 6 y = −54      5 x+ 6 y =  48     −4 x+ 0 y = −6  

So we get the equation =−4x−6.

Solving for x, we get the following.

=x1.5

To find y, we can substitute 1.5 for x in =+3x2y18, the first equation in the system.

Then we solve for y.

+31.52y =18

+4.52y =18

2y =13.5

y =6.75

So, we have found that =x1.5 and =y6.75.

This means that the rental cost for each movie is $1.50 and the rental cost for each video game is $6.75.

4 0
3 years ago
Please help me answer this question: The solution shown for the equation is incorrect. What is the correct​ solution? What is th
Anika [276]

Answer:

-8+2r=6.

2r=8+6

r=7

Step-by-step explanation:

8 0
2 years ago
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