3 years ago

What's the answer? Plz explain.

1 answer:

4 0

You got it! The minimum point of a quadratic function is basically the point at "the bottom of the bowl" on the parabola. Looking at the y-axis, we see that f(x)=-8 is the functions minimum, and the corresponding x value is 2.

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Alex flips a fair coin four times. What is the probability that he flips heads four times in a row?

sdas [7]

1/16

the probability of flipping head on the first flip is 1/2

the probability of flipping head on the second flip is 1/2 of that, or 1/4

the probability of flipping head on the third flip is 1/2 of that, or 1/8

the probability of flipping head on the fourth flip is 1/2 of that, or 1/16

4 0

2 years ago

What is the y-intercept of f(x)=3/5x<br> a. (1, 0)<br> b. (1, 3/5)<br> c. (0, 0)<br> d. (0, 1)

Digiron [165]

Answer
F(0)=0

I can put the work in the comments if you need it :)

4 0

3 years ago

Identify the vertex for the graph of y = 2x2 + 8x − 3. (2, 21) (2, 17) (−2, −11) (−2, −27)

Finger [1]

$\bf \textit{vertex of a vertical parabola, using coefficients}
\\\\
\begin{array}{lcccl}
y = & 2x^2& +8x& -3\\
&\uparrow &\uparrow &\uparrow \\
&a&b&c
\end{array}
\qquad 
\left(-\cfrac{ b}{2 a}\quad ,\quad c-\cfrac{ b^2}{4 a}\right)
\\\\\\
\left( -\cfrac{8}{2(2)}~~,~~-3-\cfrac{8^2}{4(2)} \right)\implies \left( \cfrac{-8}{4}~~,~~-3-\cfrac{64}{8} \right)
\\\\\\
\left(-2~~,~~-3-8 \right)\implies (-2~~,~~-11)$