MATHEMATICS MIDDLE SCHOOL

3. An airplane flies 105 miles in ½ hour. How far can it fly in 1 ¼ hours at the same rate of speed?

Answers

Answer 1
Answer: 262.5 miles
explanation 1/4 is half of 1/2 so 52.5 is half of 105 and then 210 for an hour of travel
Answer 2
Answer:

Answer:

105 at 30 min.

x at 75 min.

105 mph x 2 = 210 mph at one hour

There is still 15 min to go soooo...

210/4 = 52.5

210 + 52.5 = 262.5 mph for 75 min

Check by dividing

262.5/75=3.5

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What is this answer?Mark drew the following model and said it represented 21÷4 what is 21÷4?

Answers

\sqrt[4]{21}

4 goes into 21 five times, because 4 * 5 = 20

21 - 20 = 1

21 ÷ 4 = 5 r 1
The answer is 5.25 20/4=5. 1/4=25

The sum of A and B is 171 and their difference is 35. What are the numbers?

Answers

Answer:

103 and 68

Step-by-step explanation:

Given

A + B = 171

A - B = 35

Add the two expressions to eliminate B.

B + (-B) = B - B = 0

We have

2A = 206

Divide both sides by 2 to isolate A

2A/2 = 206/2

A = 103

Now substitute 103 for A in either expression to get B

Using the first expression , we have

A + B = 171

103 + B = 171

Subtract 103 from both sides

103 - 103 + B = 171 - 103

B = 68

The numbers are 103 and 68

Check

103 + 68 = 171

103 - 68 = 35

Answer:

103 and 68

Step-by-step explanation:

since the difference has to be 35 subtract 35 from 171 (equals 136) then divide it by 2, you get 68 which is your first number, then add 35 back and get 103 for the second number, I hope this helped

W -7 7/12 equals 5 + 5/12 what is w show work

Answers

w is 9/45. Ask google for more help

The prime number 19 is the average of which two different prime numbers?

Answers

31 and 7. Multiply 19 by 2 to figure out the number your adding to :)
7 + 31 = 38 and to find the average ÷ by 2 = 19

What is 0.000000028 in scientific notation

Answers

Answer:

The answer is:

0.000000028=2.8*10^-^8

Step-by-step explanation:

In order to determine the answer, we have to know about scientific notation.

In general the scientific notation is:

a*10^b

where:

a= rational number such that its absolute value has to satisfy:

1\leq |a|<10

b= the power of 10 required so that the scientific notation is mathematically equivalent to the original number.

We have to follow the next steps to determine the scientific notation of any number:

  • Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. The resulting decimal number is "a".
  • Count how many places you moved the decimal point. This number is "b".
  • If you moved the decimal to the left, "b" is positive. If you moved the decimal to the right, "b" is negative. If you did not need to move the decimal, "b" = 0.
  • Remove trailing 0's only if they were originally to the left of the decimal point.

Finally, the number 0.000000028 written in scientific notation is:

a=2.8\nb=-8\n\na*10^b=2.8*10^-^8

0.000000028=2.8*10^-^8
2.8 X 10^-8 (........characters space so that I can post this..)

Is 810 divisible by 2,3,4,5,6,9,and 10

Answers

It is divisible by 2, 3, 5, 9, and 10
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