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3 years ago

What is the answer for this math problem

Mathematics

1 answer:

nydimaria [60]3 years ago

6 0

Letter C is the answer

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If you receive a 0.75 cent discount with everything in store has a 15% discount, what would the actual price be?

marusya05 [52]

100 * 0.75 / 15 = 5

0.75 is 15%
X Is 100%

Then you draw diagonal lines:
0.75 times 100
Then divided by 15 equals

7 0

4 years ago

F(x) = 3x + x3

____ [38]

Answer:

Please check the explanation.

Step-by-step explanation:

Given

f(x) = 3x + x³

Taking differentiate

$\frac{d}{dx}\left(3x+x^3\right)$

$\mathrm{Apply\:the\:Sum/Difference\:Rule}:\quad \left(f\pm g\right)'=f\:'\pm g'$

$=\frac{d}{dx}\left(3x\right)+\frac{d}{dx}\left(x^3\right)$

solving

$\frac{d}{dx}\left(3x\right)$

$\mathrm{Take\:the\:constant\:out}:\quad \left(a\cdot f\right)'=a\cdot f\:'$

$=3\frac{d}{dx}\left(x\right)$

$\mathrm{Apply\:the\:common\:derivative}:\quad \frac{d}{dx}\left(x\right)=1$

$=3\cdot \:1$

$=3$

now solving

$\frac{d}{dx}\left(x^3\right)$

$\mathrm{Apply\:the\:Power\:Rule}:\quad \frac{d}{dx}\left(x^a\right)=a\cdot x^{a-1}$

$=3x^{3-1}$

$=3x^2$

Thus, the expression becomes

$\frac{d}{dx}\left(3x+x^3\right)=\frac{d}{dx}\left(3x\right)+\frac{d}{dx}\left(x^3\right)$

$=3+3x^2$

Thus,

f'(x) = 3 + 3x²

Given that f'(x) = 15

substituting the value f'(x) = 15 in f'(x) = 3 + 3x²

f'(x) = 3 + 3x²

15 = 3 + 3x²

switch sides

3 + 3x² = 15

3x² = 15-3

3x² = 12

Divide both sides by 3

x² = 4

$\mathrm{For\:}x^2=f\left(a\right)\mathrm{\:the\:solutions\:are\:}x=\sqrt{f\left(a\right)},\:\:-\sqrt{f\left(a\right)}$

$x=\sqrt{4},\:x=-\sqrt{4}$

$x=2,\:x=-2$

Thus, the value of x will be:

$x=2,\:x=-2$

5 0

3 years ago

If the median goes to a roller coaster. Would it be faster if it is higher or lower?? Asap plz need help

german

Neither median means in the middle unless u start from highest to lowest and cancel out letters

4 0

4 years ago

Yoohoo need help please help if u can! thanks! :)

kherson [118]

Answer: 52. 12000mililiters
53.
You move the decimal point 6 spaces to the right
54. 3,000,000meters

3 0

3 years ago

A 5-pound bag of cat food costs $11.25. What is the unit price of the cat food?

Montano1993 [528]

Answer:

C $2.25

Step-by-step explanation:

$11.25÷5=$2.25

3 0

3 years ago

Read 2 more answers