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2 years ago

If A=3x2+5x-6and B=-2x2-6x+7then A-B equals

1 answer:

6 0

Let's simplify step-by-step.3x^2+5x−6−(−2x^2−6x+7)Distribute the Negative Sign:=3x^2+5x−6+−1(−2x^2−6x+7)=3x^2+5x+−6+−1(−2x^2)+−1(−6x)+(−1)(7)=3x^2+5x+−6+2x^2+6x+−7Combine Like Terms:=3x^2+5x+−6+2x^2+6x+−7=(3x^2+2x^2)+(5x+6x)+(−6+−7)=5x^2+11x+−13Answer:=5x^2+11x−13

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Mai runs around a 400 meter track at a constant speed of 250 meters per minute. How many minutes does it take Mai to complete 4

goldfiish [28.3K]

Answer:

6.4 minutes, or 6 minutes and 24 seconds

Step-by-step explanation:

She is running 4 laps, so she is running 1600 meters total. If she runs 250 meters per minute, divide 1600 by 250 to determine how many minutes it will take...

1600/250 = 6.4

Which is 6 minutes + 0.4 minutes

*there are 60 seconds in a minute, so the 0.4 represents 40% of another minute. Multiply 60 by 0.4 to see how many seconds this is...

(0.4)60 = 24 seconds,

So she ran the laps in 6 minutes and 24 seconds

7 0

2 years ago

Read 2 more answers

Listed below are amounts (in millions of dollars) collected from parking meters by a security service company and other compan

Vikentia [17]

Answer:

$CV=\frac{0.1252}{1.57}=0.07975$

$CV=\frac{0.1317}{1.72}=0.07657$

The relative variability is almost equal in both samples a slight greater variability can be noticed in the first sample.

Step-by-step explanation:

The coefficient of variation of a sample is defined as the ratio between the mean standard deviation and the sample mean. And it represents the percentage relation of the variation of the data with respect to the average.

$CV=\frac{S}{\bar X}$

In the case of the first sample you have:

$CV=\frac{0.1252}{1.57}=0.07975$

In the case of the second sample you have:

$CV=\frac{0.1317}{1.72}=0.07657$

The relative variability is almost equal in both samples a slight greater variability can be noticed in the first sample.

6 0

2 years ago

Find the measure of the indicated angel.

schepotkina [342]

Answer:

Step-by-step explanation:

44+32=76

180-76=104

104+36=140

180-140=40

D)40

8 0

2 years ago

Use the figure to find measures of the numbered angles.

zysi [14]

1 - 113 degrees

2 - 67 degrees

3 - 67 degrees

4 - 113 degrees

Hope this helped :)

5 0

2 years ago

Read 2 more answers

Use completing the square to find the value to add that makes x^2 - 12x a perfect square trinomial. Then write the expression as

yarga [219]

Answer:

Step-by-step explanation:

If you want to make

$x^2-12x$

into a perfect square binomial, take half the linear term, square it, then add it to both sides. Our linear term is 12. Half of 12 is 6, and 6 squared is 36.

The value that makes this a perfect square binomial is 36.

Writing the expression as a square of the binomial is:

$(x^2-12x+36)-->(x-6)^2$

4 0

2 years ago