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AlexFokin [52]
3 years ago
6

Alexandra bought a hat that costs 14 dollars and a watch that costs 6 dollars. At the counter she received a discount. If she pa

id only 15 dollars, how many dollars was the discount?
Mathematics
1 answer:
leonid [27]3 years ago
6 0

Answer:

It was a 25% discount

Step-by-step explanation:

25 percent of 20 is 5. You subtract 5 from 20 and get 15.

I hope this helps.

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Schach [20]

For this case we have that by definition, it is called arcsine (arcsin) from a number to the angle that has that number as its sine.

We must find the arcsin (\frac {\sqrt {2}} {2}). Then, we look for the angle whose sine is \frac {\sqrt {2}} {2}.

We have to, by definition:

Sin (45) = \frac {\sqrt {2}} {2}

So, we have to:

arcsin (\frac {\sqrt {2}} {2}) = 45

Answer:

Option B

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-2x+y=12

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2 years ago
15 + 10y - 4xy - 6 6.​
Verdich [7]

Answer:

Step-by-step explanation:

15+10y−4xy−66

Soustraire 66 de 15 pour obtenir −51.

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Solve the system of equations using the elimination method. 2x − 3y = 50;7x + 8y = −10
lorasvet [3.4K]

Answer: C. (10, -10)

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Given

1) 2x-3y=50

2) 7x+8y=-10

Multiply both sides of 1) equation by 3.5

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2) 7x+8y=-10

Subtract 2) equation from the 1)

(7x-10.5y)-(7x+8y)=175-(-10)

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Hope this helps!! :)

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I am Lyosha [343]

For this case we must solve the following quadratic equation:

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The solution will be given by:

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Substituting the values we have:

x = \frac {-4 \pm \sqrt {4 ^ 2-4 (1) (45)}} {2 (1)}\\x = \frac {-4 \pm \sqrt {16-180}} {2}\\x = \frac {-4 \pm \sqrt {-164}} {2}

By definition we have to:

i ^ 2 = -1

So:

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