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2 years ago

You earned a 90% on a math test you answered 18 questions correctly how many questions were on the test

Mathematics

1 answer:

jekas [21]2 years ago

5 0

Answer: 20

Step-by-step explanation:

18/20 %90

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The cost of 7 chairs and 2 tables is equal.If the cost of 6 chairs and 5 tables is 10575, find the cost of 12 chairs.

Igoryamba

Answer:

5400

Step-by-step explanation:

Let x represent the cost of a chair and y represent the cost of a table. We can use this to set up a system of equations:

7x=2y

6x+5y=10575

We can solve this system using substitution.

Start by rewriting the first equation in terms of x.

$7x=2y\\\text{Divide both sides by 7}\\x=\frac{2}{7}y$

Substitute this into the second equation:

$6(\frac{2}{7}y)+5y=10575\\\frac{12}{7}y+5y+10575\\\frac{12}{7}y+\frac{35}{7}y=10575\\\frac{47}{7}y=10575$

Multiply both sides by 7

$47y=74025$

Divide both sides by 47

$y=1575$

This means...

$7x=2(1575)\\7x=3150$

Divide both sides by 7

$x=450$

One chair costs 450. Now, multiply this number by 12 to find the cost of 12 chairs.

$450*12=5400$

12 chairs cost 5400.

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2 years ago

−1/2(7z+4)+15(5z−15) =

pishuonlain [190]

Answer:

Step-by-step explanation:

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2 years ago

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(X^3y^2)^3z^4 simplify

Andru [333]

Answer:

x^9^y^2 z^4

Step-by-step explanation:

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2 years ago

Help me solve this problem please

ASHA 777 [7]

Answer:

3x plus 5 is definetely greater than -16 cause of the negative and 8 is bigger also then a negative

Step-by-step explanation:

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3 years ago

A number is less than one fourth the sum of three times the number and four.

ANEK [815]

Answer:

Step-by-step explanation:

If we write the inequality out, we get this:

x <1/4

(

)

Now we just need to solve for x. Multiplying both sides by 4 yields:

Subtract 3x from both sides:

So any number less than 4 will work!

3 0

3 years ago

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