Answer:
A. 770,000,000
Step-by-step explanation:
7.7x10^8 First step is to simplify
7.7x100,000,000 Then, multiply
770,000,000
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If Eric plays piano, then David will sing.
Answer:
![6.23 \times 10 {}^{12}](https://tex.z-dn.net/?f=6.23%20%5Ctimes%2010%20%7B%7D%5E%7B12%7D%20)
Step-by-step explanation:
![6 .23\times 10 {}^{12}](https://tex.z-dn.net/?f=6%20.23%5Ctimes%2010%20%7B%7D%5E%7B12%7D%20)
![6.23 \times 1000000000000 \\ 6230000000000](https://tex.z-dn.net/?f=6.23%20%5Ctimes%201000000000000%20%5C%5C%206230000000000)
<u>x-intercepts are found by setting y=0</u>
![y=2x^2-8x-10\rightarrow0=2x^2-8x-10](https://tex.z-dn.net/?f=y%3D2x%5E2-8x-10%5Crightarrow0%3D2x%5E2-8x-10)
<em>factor out a 2</em>
![0=2(x^2-4x-5)\rightarrow0=x^2-4x-5](https://tex.z-dn.net/?f=0%3D2%28x%5E2-4x-5%29%5Crightarrow0%3Dx%5E2-4x-5)
<em />
![0=(x-5)(x+1)](https://tex.z-dn.net/?f=0%3D%28x-5%29%28x%2B1%29)
<em>roots should be </em>x=-1,5
therefore,
x-intercepts are (-1,0) and (5,0)
<u>
</u><u>y-intercepts are found by setting x=0</u>
![y=2x^2-8x-10\rightarrow y=2(0)^2-8(0)-10](https://tex.z-dn.net/?f=y%3D2x%5E2-8x-10%5Crightarrow%20y%3D2%280%29%5E2-8%280%29-10)
![\rightarrow y=0-0-10=-10](https://tex.z-dn.net/?f=%5Crightarrow%20y%3D0-0-10%3D-10)
therefore,
y-intercept is (0,-10)