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anzhelika [568]
3 years ago
12

Would the answer for 36 be $9.88 or $9.75?

Mathematics
1 answer:
ludmilkaskok [199]3 years ago
6 0

total bill before any discounts $13.

she is a student, so she gets 20% off.

she brought an item of clothing, so she gets 5% off.

so she's really getting 20% + 5% off, namely 25% off her bill.

\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{25\% of 13}}{\left( \cfrac{25}{100} \right)13\implies 3.25}~\hfill \stackrel{\textit{bill with all discounts}}{13-3.25\implies 9.75}

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A jacket costs $90 at full price. It is on sale for 30% off the regular price. What is the amount of the discount?
Sav [38]
Remember that when you find 30% of the number you have to subtract the 30% from your original $90 because it is 30% off the original price.

5 0
3 years ago
3 Prove that<br>cos130°+cos 110+ cos10=0​
Evgesh-ka [11]

We know, cos A + cos B = 2cos(C+D)/2 × cos(C - D)/2

So,

cos 130 + cos 110 + cos 10

cos 130 + 2cos (110+10)/2 × cos( 110-10)/2

cos 130 + 2cos 60 × cos 50

cos ( 180 - 50 ) + 2cos60 cos 50

We know, cos ( 180 - A ) = -cos A

2cos 60 cos 50 - cos 50

Also, cos 60 = 0.5

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5 0
2 years ago
The figure below shows two parallel lines intersected by a third line. What is the value of x
lisabon 2012 [21]

Answer:

x = 20

Step-by-step explanation:

The two angles given in the diagram are alternate interior angles. Alternate interior angles are congruent. Therefore:

(4x)° = (x + 60)°

Use the equation to solve for the value of x

4x = x + 60

Subtract x from both sides

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Divide both sides by 3

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4 0
3 years ago
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Leni [432]

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Step-by-step explanation:

3 0
3 years ago
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ValentinkaMS [17]

Answer:

(a) 20 ways

(b) 0.05 or 5%

Step-by-step explanation:

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n=\frac{6!}{(6-3)!3!}=\frac{6*5*4}{3*2*1}=20\ ways

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C = \frac{1}{20}=0.05 = 5\%

8 0
3 years ago
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