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kolezko [41]
3 years ago
10

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

m grade Ted needs on his third test?
Mathematics
1 answer:
baherus [9]3 years ago
3 0
He must get a 65 as a minimum grade on his third test to get an average of 70.
Equation is
                       85 + 60 + x
                     ------------------- greater than or equal to 70
                              3
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Answer:

Variables:

x → The number of hours the worker worked

y → The number of shirts the worker made.

System fo equations:

\left \{ {{25x+1.75 y=270} \atop {y=5x}} \right.

Step-by-step explanation:

Let be x the number of hours the worker worked and y the number of shirts the worker made.

Since:

  • Jason must pay the worker $25 per hour (which can be represented with 25x).
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You can write the following equation:

25x+1.75 y=270

Knowing that the worker created an average of 5 shirts per hour, you can write the other equation:

y=5x

Therefore, with this equations you can set up the following system of equations, which could be used to determine the number of hours the worker worked and the number of shirts the worker made:

\left \{ {{25x+1.75 y=270} \atop {y=5x}} \right.

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2 years ago
The data below give the number of books checked out of the school library by 15 students during one month. Make a frequency tabl
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Hope I helped!
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