Me t^t i'm brain dead right now
(fractions t^t i have a test so can you explain how to do a simple fraction multiplication as well) : d

Step-by-step explanation:

multiplying fractions is usually super simple.  You just multiply the top numbers and multiply the bottom numbers.  So 2/3 * 5/7 = (2*5)/(3*7) = 10/21.

Here you have mixed fractions.  For me, the easiest way is to  make them improper fractions and then multiply them.  So 2 and 3/4 becomes 11/4 and 1 and 13/20 becomes 33/20.  Let me know if you don't get that.

Anyway, if we make the unknown fraction x we can rewrite this as an algebraic equation.

(11/4)x = 33/20  Now just multiply both sides by 4 and divide both sides by 11 and you will get

x = 3/5

Again, let me know if there's something you don't understand.  

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

where's the diagram?

step-by-step explanation: