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3 years ago

Find the midpoint of the line segment joining points A and B.

Mathematics

1 answer:

djyliett [7]3 years ago

3 0

Answer:

(7,-2)

Step-by-step explanation:

6+8÷2=7

1-5=-4÷2=-2

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A plane travels at a constant speed. It take 5 hours to travel 6,250 miles. What is the plane's speed in miles per hour?

crimeas [40]

Answer:

1,250 miles/hour

Step-by-step explanation:

To find miles per hour - $\frac{6250 miles}{5 hours}$ .

4 0

3 years ago

Please help me ASAP!!!<br><br><br> thank you

Sholpan [36]

Step-by-step explanation:

10^3 means add 3 "000"

so 10^3 × 48 = 48,000

7 0

3 years ago

A consumer survey conducted in two consecutive years found that a fixed basket of goods and services cost $36.00 in year 1 and $

docker41 [41]

Answer:

0.021/yr or 2.1%/yr

Step-by-step explanation:

Find the quotient:

$36.75/$36.00

This comes out to 1.021,

so the inflation rate is 1.021 - 1.000 = 0.021 or 2.1%/year

7 0

3 years ago

About 78% of the US, population claims that they visit the dentist at least once a year. simple random sample of 200 people is s

Blababa [14]

Answer:

D) 0.78, 0.029

Step-by-step explanation:

Central Limit Theorem:

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean $\mu = p$ and standard deviation $s = \sqrt{\frac{p(1-p)}{n}}$

About 78% of the US, population claims that they visit the dentist at least once a year.

This means that $p = 0.78$

Random sample of 200 people:

This means that $n = 200$

Mean and standard deviation of the sampling distribution:

By the Central Limit Theorem

Mean $\mu = 0.78$

Standard deviation $s = \sqrt{\frac{0.78*0.22}{200}} = 0.029$

So the correct answer is given by option D.

7 0

3 years ago

Solve: (2a²+5a+2)^1/2=3

Ghella [55]

When you have an expression to the power of (1/2) that means the same thing as having a square root.

Lets call a=x

To get rid of the square root we square both sides getting:

2x^2+5x+2= 3^2

Simplifying this we get: 2x^2+5x+2=9

We can subtract 9 from both sides getting: 2x^2+5x-7

Now when we solve for this we can use the quadratic formula:

(-b +/- sqrt(b^2-4ac)) / 2a

a=2 , b=5 , c=-7

Plugging in we end up with : (-5 +/- sqrt(81)) /4

This simplifies to : (-5 +/- 9) / 4 ..... (-5+ (-9))/4 OR (-5-(-9))/4

we have x= -14/4 , 1

3 0

3 years ago

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