Which of the following equations represents a quadratic function?

2 answers:

7 0

The answer is choice two, a quadratic follows the form ax^2 + bx + c =0

If you expand choice two out you get 8x^2 - 12x -15 = 0
Where a = 8, b= -12 and c = -15

lbvjy [14]3 years ago

5 0

I think the answer is b or choice #2.

You might be interested in

The length of a phone conversation is normally distributed with a mean of 4 minutes and a standard deviation of .6 minutes. What

Ivanshal [37]

Answer:

0.04746

Step-by-step explanation:

To answer this one needs to find the area under the standard normal curve to the left of 5 minutes when the mean is 4 minutes and the std. dev. is 0.6 minutes. Either use a table of z-scores or a calculator with probability distribution functions.

In this case I will use my old Texas Instruments TI-83 calculator. I select the normalcdf( function and type in the following arguments: :

normalcdf(-100, 5, 4, 0.6). The result is 0.952. This is the area under the curve to the left of x = 5. But we are interested in finding the probability that a conversation lasts longer than 5 minutes. To find this, subtract 0.952 from 1.000: 0.048. This is the area under the curve to the RIGHT of x = 5.

This 0.048 is closest to the first answer choice: 0.04746.

8 0

3 years ago

The coordinates of trapezoid ABCD are A(−4, 3), B(2, 3), C(4, −1) and D(−4, −1). A line segment runs through the trapezoid with

madam [21]

The distance from point Y to the y-axis is 4 units and the distance from point Z to the y-axis is 3 units, then the lelgth of the segment YZ is 4+3=7 units.
If <span>a scale factor is 3, then the length of Y'Z' will be 7·3=21 units.
</span>
P.S. In the added picture you can see trapezoid ABCD that was dilated by a scale factor 3 about the origin. This may help to understand that all linear values after dilation become multiplied by scale factor.
<span> </span>