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timama [110]
3 years ago
10

to play bingo night. there is a 10$ cover change pluse 2$ per bingo card. write an wquation of the cost of (y) based on the numb

er of bingo cards (x)
Mathematics
1 answer:
valkas [14]3 years ago
5 0
10(2x)=y

Why?
10 is the cover charge, since it's necessary I placed it alone.
( meaning multiply in math
The 2 is the charge of each bingo card
x, we don't know how many purchases are made so x will be right next to 2 meaning it's $2 per purchase. Since we don't know what x is we leave it as that.
y is the cost in this equation, since we don't know what y is we just leave it as y.

Hope this helped
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A: What are the solutions to the quadratic equation x2+9=0? B: What is the factored form of the quadratic expression x2+9? Selec
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Answer:

A. The solutions are x=3i,\:x=-3i.

B. The factored form of the quadratic expression x^2+9=(x-3i)(x+3i)

Step-by-step explanation:

A. To find the solutions to the quadratic equation x^2+9=0 you must:

\mathrm{Subtract\:}9\mathrm{\:from\:both\:sides}\\\\x^2+9-9=0-9\\\\\mathrm{Simplify}\\\\x^2=-9\\\\\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{-9},\:x=-\sqrt{-9}

x=\sqrt{-9} = \sqrt{-1}\sqrt{9}=\sqrt{9}i=3i\\\\x=-\sqrt{-9}=-\sqrt{-1}\sqrt{9}=-\sqrt{9}i=-3i

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To factor x^2+9:

First, multiply the constant in the polynomial by i^2 where i^2 is equal to -1.

x^2+9i^2

Since both terms are perfect squares, factor using the difference of squares formula

a^2-i^2=(a+i)(a-i)

x^2+9=x^2+9i^2=\left(-3i+x\right)\left(3i+x\right)

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