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mixer [17]
3 years ago
12

A family purchased tickets for a concert. They paid a total of $90 for 7 adult tickets and 12 child tickets. The price of a chil

d ticket was two-thirds the price of an an adult ticket. How much was the price of an adult ticket?
Mathematics
1 answer:
andre [41]3 years ago
4 0
A is aldult tickets
b is child tickets

b = 2/3 a

7a + 12b = 90
7a + 12 x 2/3 a = 90
7a + 8a = 90
15a = 90
a = 6; b = 4
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In triangle RST, angle R is a right angle. If TR = 6 and TS = 8, what is the length of RS
lisabon 2012 [21]

Answer:

RS = 2\sqrt{7}

Step-by-step explanation:

Using Pythagoras' identity in the right triangle

RS² + RT² = TS² , that is

RS² + 6² = 8²

RS² + 36 = 64 ( subtract 36 from both sides )

RS² = 28 ( take the square root of both sides )

RS = \sqrt{28} = \sqrt{4(7)} = 2\sqrt{7} ≈ 5.3 ( to 1 dec. place )

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I have 3 quarter , 1 nickel , 1 dime , and 3 penny . But I want to divided 2 people .
Andru [333]

The answer would be 93 cents divide it by 2 since you want to share with someone and you would have 46 cents and a nickel for both people

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2 years ago
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Afton made a chicken dish for dinner she added a 10 ounce package of vegetables and a 14 ounces package of rice to 40 ounces of
choli [55]

64 oz.

14+10=24

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Write -3+4i in the form r(cosx+isinx)
Zanzabum
-3+4i is a complex number that satisfies

\begin{cases}r\cos x=-3\\[1ex]r\sin x=4\\[1ex]r=\sqrt{(-3)^2+4^2}\end{cases}

The last equation immediately tells you that r=5.

So you have

\begin{cases}\cos x=-\dfrac35\\[1ex]\sin x=\dfrac45\end{cases}

Dividing the second equation by the first, you end up with

\dfrac{\sin x}{\cos x}=\tan x=\dfrac{\dfrac45}{-\dfrac35}=-\dfrac43

Because the argument's cosine is negative and its sine is positive, you know that \dfrac\pi2. This is important to know because it's only the case that y=\tan x\implies \arctan y=x whenever -\dfrac\pi2. The inverse doesn't exist otherwise.

However, you can restrict the domain of the tangent function so that an inverse can be defined. By shifting the argument of tangent by \pi, we have

\tan(x-\pi)=y\implies x=\pi+\arctan y

All this to say

\tan x=-\dfrac43\implies x=\pi+\arctan\left(-\dfrac43\right)\approx2.2143\text{ rad}\approx126.9^\circ

So, -3+4i=5(\cos126.9^\circ+i\sin126.9^\circ).
5 0
3 years ago
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