The length of a rectangle is three times it’s width, the perimeter of the rectangle is 56cm , find the length and width

Length: 21 cm Width: 7 cm

Step-by-step explanation:So, two of the sides are 3 units long, and two of the sides are 1 unit long. The total number of units in the perimeter of the rectangle is 8.

56cm / 8units = 7cm/unit

So, the length of the rectangle is 7cm/unit x 3 units, or 21 cm.

The width of the rectangle 1/3 of the length, or 7cm.

Length: 21 cm

Width: 7 cm

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)