Another simple math question?

Question

wah.. @_@ computer is mean.. so i havent been on recently!

anyways...

if you guys aer willing to help me answer these.. i raelly appreciate it!

One less than three times of the width of a rectangle is the length of the rectangle. The length is 14 cm. what is the width?

Jessica wants to construct a new rectangular graden bed by 2.5 metres by 1.5 metres

A] what will the length of the diagonal be? to the nearest tenth of a metre?

B] what length of fencing will sh e need to enclose the garden??

please explain THOROUGLY. >< because i need to write down the steps so i could understand the question and know how to do it later on.

thanks a million!

Answer 1

One less than three times of the width of a rectangle is the length of the rectangle. The length is 14 cm. what is the width?

w=3x-1

L=14

put in equation

3x-1=14

transpose -1 to the other side it becomes +1

3x=14+1

3x=15

divide both sides by 3

x=15/3

x=5

Jessica wants to construct a new rectangular garden bed by 2.5 metres by 1.5 metres

a. use the pythagorean theorem c2=a2+b2

c2=a2+b2

c2=(1.5)square + (2.25)square

c2= 2.25+6.25

c2=8.5

to remove the square on c, square root 8.5 the answer is 2.9154 meters..answer is 2.92

b. perimeter = a(2)+b(2) or add all the sides of it

p= 1.5(2)+2.25(2)

  =3+5

  = 8 meters

p=1.5+1.5+2.25+2.25

  = 8 meters

Answer 2

5 cm.

Answer 3

why don&#039;t you get a study partner, or study group. And if you don&#039;t understand something in class always raise your hand and ask questions until you understand the problem.

Answer 4

first one...

the words suggest the equation:

L=3w-1

if L=14, then solve:

14=3w-1

15=3w

w=5

for the second one, use the pythagorean theorem to determine the diagonal:

diagonal = sqrt[2.5x2.5+1.5x1.5]

the length of fencing is the perimeter of the garden, which is 2x2.5+2x1.5 = 8