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Tpy6a [65]
3 years ago
12

3.5 hours: $10 1/2 hour: $1.25. which is the better deal

Mathematics
1 answer:
andrey2020 [161]3 years ago
8 0
3.5 hours: $10 because if a 1/2 hour equaled 1.25 : 3.5 hours would give you $7.75
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What two numbers' sum=-4 and product=-2
n200080 [17]

Let <em>a</em> and <em>b</em> be the two numbers. Then

<em>a</em> + <em>b</em> = -4

<em>a b</em> = -2

Solve the second equation for <em>b</em> :

<em>b</em> = -2/<em>a</em>

Substitute this into the first equation:

<em>a</em> - 2/<em>a</em> = -4

Multiply both sides by <em>a</em> :

<em>a</em>² - 2 = -4<em>a</em>

Move 4<em>a</em> to the left side:

<em>a</em>² + 4<em>a</em> - 2 = 0

Use the quadratic formula to solve for <em>a</em> :

<em>a</em> = (-4 ± √(4² - 4(-2))) / 2

<em>a</em> = -2 ± √6

If <em>a</em> = -2 + √6, then

-2 + √6 + <em>b</em> = -4

<em>b</em> = -2 - √6

In the other case, we end up with the same numbers, but <em>a</em> and <em>b</em> are swapped.

7 0
3 years ago
Explain the difference between prime and composite numbers
Fed [463]
Prime only has two factors one and its self a composite number has more factor than one and its self
exsample:     12 -  1,2,3,4,6,12  = 12 is a composite number
                       7  -  1,7                 =prime number 
4 0
3 years ago
( brainliest )<br><br> What is the area of this figure?
algol [13]
Pretty sure its 132 

Hope this helps!
4 0
3 years ago
Which variable expression matches the word phrase? Column A Column B
erik [133]
<span>1. the sum of 12 and the quotient of 9 and a number

The responder's answer is not given but it can be 12 + (9 / n)

2. </span>the difference of 12 and the product of 9 and a number

The responder's answer would be <span>c. 12 – 9y

3</span>. the difference of 12 and the quotient of 9 and a number

The responder's answer would be <span>b. 12 – (9 ÷ y)
</span>
<span>4. 12 more than quotient of a 9 and number
</span>
The responder's answer would be<span> a. 12 + (9 ÷ y)</span>






4 0
3 years ago
I have this math question that I need an answer to. it's 3/4 - 2/5
Marysya12 [62]

Answer:

7/20

3/4-2/5=7/20

4 0
3 years ago
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