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ddd [48]
3 years ago
8

Which of the following equations represents a quadratic function?

Mathematics
2 answers:
spin [16.1K]3 years ago
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.
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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>

5 0
3 years ago
Read 2 more answers
Use the Pythagorean Theorem to find the distance from Anna's house to the tree house. A) 105 B) 141 C) 193 D) 89
Naily [24]
The answer will be b 105
8 0
4 years ago
How do you write 186.1 in scientific notation? ____× 10^____
Anvisha [2.4K]

Answer:

1.861(10²)

Step-by-step explanation:

Proper scientific notation only has the ones place and decimals. To get the same value again, we would need the exponent to be 2 and not -2.

7 0
3 years ago
How do I solve this?
Aleksandr-060686 [28]
First you have to set up your equation. 5x+80 and x+15. 
8 0
4 years ago
Read 2 more answers
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