Answer:
Step-by-step explanation:
x=2,x-2=0
x=8
x-8=0
y=(x-2)(x-8)=x²-2x-8x+16=x²-10x+16
=x²-10x+25-25+16
=x²-10x+25-9
y=(x-5)²+9
axis of symmetry is x-5=0 or x=5
Answer:
1. y=5-2x
2. -y=5-2x
3. 
Step-by-step explanation:
1. 2x+y=5
y=5-2x
2. 2x-y=5
-y=5-2x
3. x+2y=5
2y=5-x
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Answer:
17.5
Step-by-step explanation:
According to the study 70% of the internet searches used Google as search engine.
Thus if the event X is the proportion of the searches using Google engine, then expected value of the event X, E(X) = 0.7
From here we can find the expected number of internet searches of a sample of 25 people by multiplying 25 and 0.7, i.e 25*0.7=17.5
