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3 years ago

Please I really need help answer question 2.

Mathematics

1 answer:

kati45 [8]3 years ago

4 0

Let the number of CD's be x and total cost be y

y=7x-10

*the 7 comes from the price of each individual CD ($7)
*the 10 comes from the discount ($10)

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The length of a rectangle is 3 times the width. The perimeter of the rectangle is 72cm. Find the dimensions of the rectangle

larisa86 [58]

Answer:

Length: 27 width:9

Step-by-step explanation:

27 + 27 + 9 + 9 = 72 and 27 is 3 x 9

8 0

2 years ago

When solving systems of equations with the elimination

viktelen [127]

Step-by step explanation:

That's a great question. Look for things such as these:

x=x (infinite solution)

x=12 (one solution)

x+3 = x + 5 (no solutions)

https://youtu.be/bq5gDsEdN3Q this video has more information, copy and paste the link into your search engine.

4 0

2 years ago

Which number is greater 5 or 1

11111nata11111 [884]

Answer:

Step-by-step explanation:

5 is greater than 1 because it is further to the right from zero on the number line

5 0

3 years ago

Find the value of the variable y, where the sum of the fractions 6/(y+1) and y/(y-2) is equal to their product.

Blizzard [7]

Answer:

The answer is

$y = 3$

$y = - 4$

Step-by-step explanation:

We must find a solution where

$\frac{6}{y + 1} + \frac{y}{y - 2} = \frac{6}{y + 1} \times \frac{y}{y - 2}$

Consider the Left Side:

First, to add fraction multiply each fraction on the left by it corresponding denomiator and we should get

$\frac{6}{y + 1} \times \frac{y - 2}{y - 2} + \frac{y}{y - 2} \times \frac{y + 1}{y + 1}$

Which equals

$\frac{6y - 12}{(y -2) (y + 1)} + \frac{ {y}^{2} + y }{(y - 2)(y + 1)}$

Add the fractions

$\frac{y {}^{2} + 7y - 12 }{(y - 2)(y + 1)} = \frac{6}{y + 1} \times \frac{y}{y - 2}$

Simplify the right side by multiplying the fraction

$\frac{6y}{(y + 1)(y + 2)}$

Set both fractions equal to each other

$\frac{6y}{(y + 1)(y - 2)} = \frac{ {y}^{2} + 7y - 12}{(y + 1)(y - 2)}$

Since the denomiator are equal, we must set the numerator equal to each other

$6y = {y}^{2} + 7y - 12$

$= {y}^{2} + y - 12$

$(y + 4)(y - 3)$

$y = - 4$

$y = 3$

6 0

2 years ago

Read 2 more answers

Which function has an inverse that is also a function? {(–4, 3), (–2, 7), (–1, 0), (4, –3), (11, –7)} {(–4, 6), (–2, 2), (–1, 6)

DaniilM [7]

(-4,4) because its at the same hold for the other functions

4 0

2 years ago

Read 2 more answers