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3 years ago

CDs costs $4 each and DVD cost $8 each.

Mathematics

1 answer:

Licemer1 [7]3 years ago

8 0

Answer:

0 and 4

1 and 3

2 and 2

3 and 1

4 and 0

Step-by-step explanation:

If you need 4 gifts and you want to spend less than $40, then you could buy

1 cd+ 3 dvds for $25

2 cds + 2 dvds for $24

3 cds + 1 dvd for $20

4 cds and 0 dvds for $16

0 cds and 4dvds for $32

Any of these solutions will work

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What is the factored form of the polynomial ? X^2+9x+20

Blababa [14]

The answer is (x+4)(x+5)

3 0

4 years ago

Select the correct answer.

Sati [7]

Answer:

x > 1

Step-by-step explanation:

Subtract 2 from both sides

-26 + 13x > -13x

Add 26 to both sides

13x > -13x + 26

Add 13x to both sides

13x + 13x > -13x + 26 + 13x

Simplify

26x > 26

So x > 1

6 0

3 years ago

Derivatives concept: Exercises using the definition of derivatives: (Full development)

krok68 [10]

(A) f(x) = 7 is constant, so f(x + h) = 7, too, which makes f(x + h) - f(x) = 0. So f'(x) = 0.

(B) f(x) = 5x + 1 ==> f(x + h) = 5 (x + h) + 1 = 5x + 5h + 1

==> f(x + h) - f(x) = 5h

Then

$\displaystyle f'(x) = \lim_{h\to0}\frac{5h}h = \lim_{h\to0}5 = 5$

(C) f(x) = x ² + 3 ==> f(x + h) = (x + h)² + 3 = x ² + 2xh + h ² + 3

==> f(x + h) - f(x) = 2xh + h ²

$\implies\displaystyle f'(x) = \lim_{h\to0}\frac{2xh+h^2}h = \lim_{h\to0}(2x+h) = 2x$

(D) f(x) = x ² + 4x - 1 ==> f(x + h) = (x + h)² + 4 (x + h) - 1 = x ² + 2xh + h ² + 4x + 4h - 1

==> f(x + h) - f(x) = 2xh + h ² + 4h

$\implies \displaystyle f'(x) = \lim_{h\to0}\frac{2xh+h^2+4h}h = \lim_{h\to0}(2x+h+4) = 2x+4$

5 0

3 years ago

igomit [66]

Answer:

x = 1/10

Step-by-step explanation:

2/x -2 = 3/2x +3

Add 2 to each side

2/x -2+2 = 3/2x +3+2

2/x = 3 /2x +5

Subtract 3/2x from each side

2/x -3/2x = 3 /2x - 3/2x +5

2/x - 3/2x = 5

Get a common denominator

2/x *2/2 -3/2x =5

4/2x - 3/2x = 5

1/2x =5

Multiply each side by 2x

1 /2x * 2x = 5 *2x

1 = 10x

Divide each side by 10

1/10 = 10x/10

1/10 =x

4 0

3 years ago

Find the value of x in the figure below. Round to the nearest tenth.

SCORPION-xisa [38]

Answer:

Step-by-step explanation:

We can find x using tan 40° which can be represented as x/20. tan 40° is also equal to about 0.8 so that means x / 20 = 0.8 and x = 16.

6 0

3 years ago