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3 years ago

-4x + 7y = 18

Mathematics

1 answer:

sasho [114]3 years ago

5 0

Answer:

Step-by-step explanation:

Subtract 7y7y from both sides.

-4x=18-7y−4x=18−7y

2 Divide both sides by -4−4.

x=-\frac{18-7y}{4}x=−

18−7y

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Musya8 [376]

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3 years ago

A certain pickup truck gets 20mpg in the city and 28 mpg on the highway. If the driver drives 270 mi on 11 gal of gas, determine

Snezhnost [94]

Answer:

95 city and 175 highway miles.

Step-by-step explanation:

The driver gets 20 mpg in city, and 28 mpg on the highway.

An equation that could be written is

20x+28y=270

This equation accounts for the distance traveled.

x+y=11

This equotion accounts for how many gallons were driven.

Multiply the bottom equation by 20, so you can solve the set of equations.

20x+28y=270

20x+20y=220

subtract them

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now plug this back into x+y=11

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4 years ago

Julius has 4 blue marbles if 1/3 of Julius' marbles are blue how many marbles does Julius have how explain

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She has 12 marbles because 14x3=12

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3 years ago

Read 2 more answers

Rewrite 4n^2+2n as a factorial.

Shkiper50 [21]

Answer:

4n²+2n as a factorial is given as:

$= (2n+1)!/(2n-1)!$

Step-by-step explanation:

We are given an expression which has to be converted into factorial form.

The expression is as follows:

$4n^{2} + 2n\\ = 2n(2n+1)\\ = (2n+1)2n\\$

Now we know that 2n+1 and 2n differs by '1' and the next smaller term is '2n-1'.

Hence, multiplying and dividing by '(2n-1)!'; we get:

$= ((2n+1)(2n)(2n-1)!)/(2n-1)!$

we know that x(x-1)(x-2)! = x!, so:

$= (2n+1)!/(2n-1)!$

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3 years ago

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Step-by-step explanation:

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