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timurjin [86]
4 years ago
14

John bought three cars in the last year for a total of $30,000 he paid the same amount for each of the first two cars and got th

e third one for twice the amount of the first car which equation can be used to find out how much John paid for each car? Ignore sales tax
1.x(30,000)=2x
2.x + 2x=30,000
3.30,000x=x+2x
4.x+x+2x=30,000
Mathematics
2 answers:
max2010maxim [7]4 years ago
7 0
The 4th answer would be the best equation to find out how much John paid for each car
Ksivusya [100]4 years ago
6 0
The answer is 4. Let’s say x is equal to 7.5. The price of the first 2 cars were they same price and that price being x. Therefore the third car price is double the first meaning it is 2x. The last equation shows a proper mathematical equation.
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Exercise 2.4.2: Proving statements about rational numbers with direct proofs. About Prove each of the following statements using
IgorLugansk [536]

Answer:

See Explanation

Step-by-step explanation:

(a) Proof: Product of two rational numbers

Using direct proofs.

Let the two rational numbers be A and B.

Such that:

A = \frac{1}{2}

B = \frac{2}{3}

The product:

A * B = \frac{1}{2} * \frac{2}{3}

A * B = \frac{1}{1} * \frac{1}{3}

A * B = 1 * \frac{1}{3}

A * B = \frac{1}{3}

Proved, because 1/3 is rational

(b) Proof: Quotient of a rational number and a non-zero rational number

Using direct proofs.

Let the two rational numbers be A and B.

Such that:

A = \frac{1}{2}

B = \frac{2}{3}

The quotient:

A / B = \frac{1}{2} / \frac{2}{3}

Express as product

A / B = \frac{1}{2} / \frac{3}{2}

A / B = \frac{1*3}{2*2}

A / B = \frac{3}{4}

Proved, because 3/4 is rational

(c) x + y is rational (missing from the question)

Using direct proofs.

Let x and y be

Such that:

x = \frac{1}{2}

y = \frac{2}{3}

The sum:

x + y = \frac{1}{2} + \frac{2}{3}

Take LCM

x + y = \frac{3+4}{6}

x + y = \frac{7}{6}

Proved, because 7/6 is rational

<em>The above proof works for all values of A, B, x and y; as long as they are rational values</em>

8 0
3 years ago
I need help on this question pls​
Ivanshal [37]

Answer:

t = 17.5 f = 12

Step-by-step explanation:

If <em>MNOP </em>is a square, you know that each angle is going to be 90°. To solve, let's first set each equation equal to 90°:

90 = 4t + 20

and

90 = 7f + 6

Then solve both equations:

90 = 4t + 20 \\ 70 = 4t \\ 17.5 = t

and

90 = 7f + 6 \\ 84 = 7f \\ 12 = f

I hope that helps!

7 0
3 years ago
You are working as an office apprentice for the bksb Newcastle Arena. You are helping collect a customer satisfaction survey for
Nana76 [90]

Answer:

Step-by-step explanation:

6 0
3 years ago
Can someone please help me?
bulgar [2K]

Solution:

<u>Given:</u>

  • 18 = 2b

<u>Solve the equation by isolating the variable.</u>

  • => 18 = 2b
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The value of b is 9.

Hoped this helped!

6 0
2 years ago
Help me simplify this
Komok [63]

Answer:

4√7-8

Step-by-step explanation:

7 0
3 years ago
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