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3 years ago

What does an equation have that an expression doesn't?

Mathematics

2 answers:

Akimi4 [234]3 years ago

4 0

Answer:

the answer is an equal sign

nignag [31]3 years ago

3 0

Answer:

An equal sign

Step-by-step explanation:

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What two numbers can add to 4 but multiple to -12

olasank [31]

Answer:

<em>Numbers: 6 and -2</em>

Step-by-step explanation:

<u>Equations</u>

This question can be solved by inspection. It's just a matter of factoring 12 into two factors that sum 4. Both numbers must be of different signs and they are 6 and -2. Their sum is indeed 6-2=4 and their product is 6*(-2)=-12.

However, we'll solve it by the use of equations. Let's call x and y to the numbers. They must comply:

$x+y=4\qquad\qquad [1]$

$x.y=-12\qquad\qquad [2]$

Solving [1] for y:

$y=4-x$

Substituting in [2]

$x(4-x)=-12$

Operating:

$4x-x^2=-12$

Rearranging:

$x^2-4x-12=0$

Solving with the quadratic formula:

$\displaystyle x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

With a=1, b=-4, c=-12:

$\displaystyle x=\frac{-(-4)\pm \sqrt{(-4)^2-4(1)(-12)}}{2(1)}$

$\displaystyle x=\frac{4\pm \sqrt{16+48}}{2}$

$\displaystyle x=\frac{4\pm 8}{2}$

The solutions are:

$\displaystyle x=\frac{4+ 8}{2}=6$

$\displaystyle x=\frac{4- 8}{2}=-2$

This confirms the preliminary results.

Numbers: 6 and -2

7 0

3 years ago

A 16 oz package of brown rice costs 79 cents and 32 oz package of white rice costs $3.49. Which package is a better buy

notka56 [123]

32 Oz of brown rice -> 79 * 2 = $1.58

The brown rice is better to buy because $1.52 is less than $3.49.

Please make this answer the brainiest~

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Benito is selling T-shirts for $8 each for his school fund-raiser. So far, he has sold 16 T-shirts. How many more does he need t

zhannawk [14.2K]

D. When you do the math, the results to everything should be t=9. D is the only outlier. Therefore, D is the answer in this case.

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3 years ago

2 3/5 ×5/6 = what does it equel

wolverine [178]

Your answer is 2 and 1/6

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2 years ago

What is the absolute value of -4 - the square root of -2

ollegr [7]

The answer is 8 it should be

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3 years ago

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