The length of a rectangle is 9 inches more than twice it's with if the perimeter of the rectangle is 90 inches find its length and width

perimeter = 2L + 2W

L = 2w+9

90 = 2(2w+9) + 2W

90 = 4W+18 +2W

90 = 6W +18

72 = 6w

w = 72/6 = 12

l = 2*12+9 = 33

2x12 = 24, 2x33 = 66, 66+24 = 90

Length = 33 inches

Width = 12 inches

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!