Math Help

Archive for February, 2006

Question: maths quadratic equations HELP?

1.the product of two consecutive interers is 342. find the integers.(using the quadratic equations method)
2.a rectangular playground has a perimeter of 60m and an area of 216cm square. find the dimensions of the playground.
3.in a two digit number, the tens digit is 5 lesser than the ones digit. the number is 14 greater than the product f the digits.find the number

thats all. easy 10 points.. please help im revising these for my tests…

Answer: Hi,

1.the product of two consecutive integers is 342. find the integers.(using the quadratic equations method)

x(x + 1) = 342

x² + x – 342 = 0

(x + 19)(x – 18) = 0

x + 19 = 0
x = -19
x + 1 = -18

x – 18 = 0
x = 18
x + 1 = 19

The numbers can be either -19 and -18, or 18 and 19. <==ANSWER

2.a rectangular playground has a perimeter of 60m and an area of 216cm square. find the dimensions of the playground.

2L + 2W = 60

L + W = 30

W = 30 - L

LW = 216

L(30 - L) = 216

30L - L² = 216

L² - 30L + 216 = 0

(L - 18)(L - 12) = 0

L - 18 = 0
L = 18

L - 12 = 0
L = 12

The playground was 18 m x 12 m. <==ANSWER

3.in a two digit number, the tens digit is 5 lesser than the ones digit. the number is 14 greater than the product f the digits.find the number

T = U - 5

10T + U - 14 = TU

10(U - 5) + U - 14 = (U - 5)U

10U - 50 + U - 14 = U² - 5U

11U - 64 = U² - 5U

U² - 16U + 64 = 0

(U - 8)(U - = 0

U - 8 = 0

U = 8

T = U - 5
T = 8 - 5 = 3

The number is 38. <==ANSWER

I hope that helps!!

Math Refresher – YourTeacher.com – 1000+ Online Math Lessons

Question: Help With Math percentage & tax problems?

Thank you!

1. The number 126 is 35% of what number?

2. A retirement dinner for two $65.40 including tax. Find the total cost if a 20% tip is added to the cost.

3. The number of text messages rose from 996 million in June to 1110 million in December. Find the percent increase. Round to the nearest whole percent.

4. Find the orignal price of a popular pair of shoes if the increased price is $80 after a 25% increase.

Answer: //
126/0.35=360

Percent of a Number – YourTeacher.com – Math Help

Question: how do i make Math models to find each product?

these products are the ones that i dont get and i need to make models for them:

Make a model to find each product:

4x 0.4= 1.6

3x 0.55=1.65

9x 0.13=1.17

0.21x 6=1.26

****PLEASE HELP (NOT HOMEWORK)its for a work that i have to test a 5th grader and i forgot to do these so please help thanks!!!!!! BEST ANSWER!!!!

and SORRY BUT i dont get these ones please and thank u

rita needs to get 16 pastels and 3 erasers for her class.She cannot get to store A.She can go to store B,

Answer: 1. MODEL: 4 x 0.4=? SOLUTION: ?=1.6
2. MODEL: 3 x 0.55=? SOLUTION: ?=1.65
3. MODEL: 9 x 0.13=? SOLUTION: ?=1.17
4. MODEL: O.21 x 6=? SOLUTION: ?=1.26

Teaching Kindergarten Math : Teaching Kids Numbers with Dot Worksheets