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I also got 422.5km/h..

how i got it...formula is

AVE SPEED = TOTAL DISTANCE / TOTAL TIME

Posted on Sep 10, 2009

422.5 Km./Hr.

Posted on Nov 27, 2008

First translate the various statements of the problem into equations. then try to solve the equations. It won't do much good if I just gave you the answers.

Sep 27, 2014 | Mathsoft StudyWorks! Middle School Deluxe...

The diameter is twice the radius, so 3474.8 km.

Jul 16, 2014 | The Learning Company Achieve! Math &...

The following are examples of expressions:

2

*x*

3 + 7

2 ×*y* + 5

2 + 6 × (4 - 2)

*z* + 3 × (8 - *z*)

Example:

Roland weighs 70 kilograms, and Mark weighs*k* kilograms. Write an expression
for their combined weight. The combined weight in kilograms of these two people
is the sum of their weights, which is 70 + *k*.

Example:

A car travels down the freeway at 55 kilometers per hour. Write an expression for the distance the car will have traveled after*h* hours. Distance equals rate
times time, so the distance traveled is equal to 55 × *h*..

Example:

There are 2000 liters of water in a swimming pool. Water is filling the pool at the rate of 100 liters per minute. Write an expression for the amount of water, in liters, in the swimming pool after*m* minutes. The amount of water added
to the pool after *m* minutes will be 100 liters per minute times *m*,
or 100 × *m*. Since we started with 2000 liters of water in the pool,
we add this to the amount of water added to the pool to get the expression 100 ×
*m *+ 2000.

To evaluate an expression at some number means we replace a variable in an expression with the number, and simplify the expression.

Example:

Evaluate the expression 4 ×*z* + 12 when *z* = 15.

We replace each occurrence of*z* with the number 15, and simplify using the
usual rules: parentheses first, then exponents, multiplication and division, then
addition and subtraction.

4 ×*z* + 12 becomes

4 × 15 + 12 =

60 + 12 =

72

Example:

Evaluate the expression (1 +*z*) × 2 + 12 ÷ 3 - *z* when
*z* = 4.

We replace each occurrence of z with the number 4, and simplify using the usual rules: parentheses first, then exponents, multiplication and division, then addition and subtraction.

(1 +*z*) × 2 + 12 ÷ 3 - *z* becomes

(1 + 4) × 2 + 12 ÷ 3 - 4 =

5 × 2 + 12 ÷ 3 - 4 =

10 + 4 - 4 =

10.

**hope that help you**

2

3 + 7

2 ×

2 + 6 × (4 - 2)

Example:

Roland weighs 70 kilograms, and Mark weighs

Example:

A car travels down the freeway at 55 kilometers per hour. Write an expression for the distance the car will have traveled after

Example:

There are 2000 liters of water in a swimming pool. Water is filling the pool at the rate of 100 liters per minute. Write an expression for the amount of water, in liters, in the swimming pool after

To evaluate an expression at some number means we replace a variable in an expression with the number, and simplify the expression.

Example:

Evaluate the expression 4 ×

We replace each occurrence of

4 ×

4 × 15 + 12 =

60 + 12 =

72

Example:

Evaluate the expression (1 +

We replace each occurrence of z with the number 4, and simplify using the usual rules: parentheses first, then exponents, multiplication and division, then addition and subtraction.

(1 +

(1 + 4) × 2 + 12 ÷ 3 - 4 =

5 × 2 + 12 ÷ 3 - 4 =

10 + 4 - 4 =

10.

Jun 22, 2011 | LeapFrog Turbo Twist Math Cartridge 5th...

The answer is 2: a.m. the next day.

This is a total of 20 hours later, as every 2 hours clock 1 is 3 minutes ahead, so just times it by 10!

This is a total of 20 hours later, as every 2 hours clock 1 is 3 minutes ahead, so just times it by 10!

Mar 03, 2011 | M2K Garfield: It's All About Math Math...

Basic formula: F = M * A

where:

F = force

M = mass

A = acceleration

Keep 'F' constant, and increase 'M', and 'A' will be reduced.

So, lower acceleration means less travel.

where:

F = force

M = mass

A = acceleration

Keep 'F' constant, and increase 'M', and 'A' will be reduced.

So, lower acceleration means less travel.

Mar 26, 2010 | The Learning Company Achieve! Math &...

Its simple, 60 minutes in an hour / 2 minutes length = 30 calls per hour.

30 calls per hour X 7.5 hours = 225 CALLS

225 CALLS

30 calls per hour X 7.5 hours = 225 CALLS

225 CALLS

Feb 10, 2010 | Bagatrix Basic Math Solved! 2005 (305101)...

Compute the difference in clock-speeds, namely 90 seconds per hour.

Convert the units of time: 30 minutes becomes 180 seconds.

So, divide 180 by 90 to get '2', namely 2 hours after the 6 o'clock "start" time, which makes it 8 PM.

P.S. There is at least one error in the above solution. If you truly understand the solution, make the necessary correction, and submit the corrected "homework" to your teacher.

Convert the units of time: 30 minutes becomes 180 seconds.

So, divide 180 by 90 to get '2', namely 2 hours after the 6 o'clock "start" time, which makes it 8 PM.

P.S. There is at least one error in the above solution. If you truly understand the solution, make the necessary correction, and submit the corrected "homework" to your teacher.

Jan 07, 2010 | M2K Garfield: It's All About Math Math...

Ms. Reck's trip on her bike took 3 times longer (48/16ths) so the service station was 48 km from her home. It took her one hour (1x48km)= 48km) to get there and 3 hours to get home (3x16=48km) for a total of 4 hours...

Nov 22, 2009 | The Learning Company Achieve! Math &...

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