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Katena32 [7]
3 years ago
14

What expression is this equivalent to -4x^2 + 2x - 5(1 + x)

Mathematics
1 answer:
BabaBlast [244]3 years ago
4 0

Answer:

-4x^2 -3x - 5

Step-by-step explanation:

-4x^2 + 2x - 5(1 + x)

Distribute

-4x^2 + 2x - 5 -5x

Combine like terms

-4x^2 -3x - 5

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Over the first five years of owning her car, Gina drove about 12,700 miles the first year, 15,478 miles the second year, 12,675
kvv77 [185]

Answer:

Part a)

Mean: 13155.6

Mode:None

Median: 12700

Step-by-step explanation:

12700 : 1

15478: 2

12675: 3

11850: 4

13075: 5

Mean :  

=\frac{Sum of all values}{Total no. of values} \\=\frac{12700 + 15478 + 12675 + 11850 + 13075}{5}\\=\frac{65778}{5}\\= 13155.6

Mode:

All values are distinct, therefore there is no mode. A mode is value which occurs most frequently.

Median:

Arrange the values in ascending order:

11850 , 12675, 12700, 12075, 15478

The mid value is median: 12700


Part b)

It depends upon the data. In this question the best way to predict how many miles Gina will drive in the next years is by using Median of the data.

The reason is that there is a potential outlier in the data  i.e 15478. In case of outlier median tends to give better predictions.

6 0
3 years ago
What product is equivalent to 25x^2 - 16?
BlackZzzverrR [31]
25x^2 - 16 = (5x - 4)(5x + 4)
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Researchers at a medical school conducted a study to test the effectiveness of a new drug for lowering cholesterol. The 52 subje
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Answer:

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Step-by-step explanation:

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The difference in cholesterol level is the DEPENDENT variable. This is because the difference in cholesterol level is what the researcher wants to determine.

The treatment with a drug or placebo is the INDEPENDENT variable. This is because this is what the researcher manipulates to determine the difference in cholesterol level which is the dependent variable in this experimental study.

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Answer:

The question is false

Step-by-step explanation:

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