Math Help

Archive for December, 2008

Question: 4th Grade Math Homework (really easy)?

My little sister needs help with her math homework. I promised I would help her, but I really don’t want to take the time! These are really easy questions, too!

Lauren throws her first pitch of the season for her school’s softball team. If the ball travels 80 ft and takes 1.58 seconds to travel this distance, what is the speed of the ball? (Remember- Distance divided by time = speed)

A motocross racer covers one lap of a 1200 meter track on his motorcycle at a speed of 27 meters/sec. How long does it take him to ride one lap in seconds and then in minutes?

Calculate the speed for each of the following objects:

A plane flew 350km in 30 min

The girls skated past 55 trees 4.5m apart in 3 min

The car traveled 240 miles in 4 hours.

The camel walked 20km
Please I got to get this to her soon!

Answer: pitch is thrown at 50.632911 ft per second

2nd question doesn’t make sense.. 27 seconds and .45 minutes

11.67 km per minute

82.5 feet per minute

60 miles per hour

First Grade Math Lessons : Two Digit Addition for First Grade Math

Question: Permutations/combinations MATH!!!!?

i have an exam this monday and i just dont get all the permutation/combination questions.
can someone help me solve this problem:
In how many ways can the letters of the word FAIRGROUND be arranged? If the letters are arranged in a line at random what is the probability that the two r’s are together at the beginning of the arrangement?
thanks!

Answer: (i)

10! / 2! = 1814400

(ii)

(10 – 2)!
= 8!
= 40320

Permutations – YourTeacher.com – Math Help

Question: PLEASE HELP- Simple math problems (Percent of Change)?

okay so the directions say “Use the percent of change equation to find the new amount. Round your answer to the nearest Tenth”
One of the problems is “350 increased by 7%”
Please show me how to do the problem,!

Answer: (350 * 100% ) + (350 * 7%)
350 + 24.50
374.5

Percent Increase – YourTeacher.com – Pre Algebra Help