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3 years ago

If 7 key chains cost $55.65, then 12 key chains cost $

Mathematics

1 answer:

Nimfa-mama [501]3 years ago

3 0

Divide $55.65 by 7 to get the cost of 1 key chain ($7.95). Then multiply the cost of 1 by 12 and get $95.40

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Solutions for 2x^2+18x=20, worth a TON, please only 100% answers ! Thank u !

victus00 [196]

Answer:

The solution of the given quadratic equation is 1 and (-10).

Step-by-step explanation:

$2x^2+18x=20$

$x^2+9x=\frac{20}{2}$

$x^2+9x-10=0$

$ax^2+bx+c=0$

Solving equation by quadratic formula:

Here , a = 1,b = 9, c = (-10)

$D=b^2-4ac=(9)^2-4(1)(-10)=121$

$x=\frac{-b+{\sqrt{D}}}{2a}=\frac{(-9)+\sqrt{121}}{2(1)}=1$

$x=\frac{-b-{\sqrt{D}}}{2a}=\frac{(-9)-\sqrt{121}}{2(1)}=(-10)$

The solution of the given quadratic equation is 1 and (-10).

5 0

2 years ago

Compute the requested value. Choose the correct answer.

Fiesta28 [93]

Original price of the item = $14.95

Price after discount = $13.79

Discount offered = original price - price after discount = 14.95- 13.79 = $1.16

Now let us find the percentage of discount offered.

Percentage discount is given by the formula:

$Percentage discount = \frac{MP-SP}{MP}*100$

Where MP= Marked price= original price

SP= selling price= price after discount

$Percentage discount = \frac{1.16}{14.95}*100$

Percentage discount = 7.759 %

7 0

3 years ago

Read 2 more answers

The total cost C for p pounds of lithium if each pound cost $5.44

Vikki [24]

c + p = $5.44

That's the equation

3 0

3 years ago

Read 2 more answers

What is the opposite of dividing by 21? A. dividing by 21 B. multiplying by 21 C. subtracting 21 D. adding 21

Illusion [34]

Answer:

the correct answer is option B

5 0

3 years ago

<img src="https://tex.z-dn.net/?f=product%20%5C%3A%20of%20%5C%3A%205x%20%5C%3A%206y%20%5C%3A%20and7z" id="TexFormula1" title="pr

adoni [48]

Answer:

210xyz

Step-by-step explanation:

Given

5x × 6y × 7z

= 5 × x × 6 × y × 7 × z

= 5 × 6 × 7 × x × y × z

= 210xyz

5 0

2 years ago