X - unit of length
w,l - the sides of a rectangle
7 : 2 ⇒ 7x : 2x
Perimeter: P = 207cm
Perimeter: P = 2w + 2l
therefore: 2w + 2l = 207 |divide both sides by 2
w + l = 103.5 (cm)
w : l = 7 : 2 ⇒ w : l = 7x : 2x ⇒ w = 7x; l = 2x
subtitute
7x + 2x = 103.5
9x = 103.5 |divide both sides by 9
x = 11.5 (cm)
7x = 7 · 11.5cm = 80.5cm
2x = 2 · 11.5cm = 23cm
w = 80.5cm; l = 23cm
Area = wl
Area: A = 80.5cm · 23cm = 1851.5cm²
Answer:
can u type it so i can answer, i cant see it
Step-by-step explanation:
Answer:
10/12 is equal to 5/6
Step-by-step explanation:
We know that because 5 is half of 10, and 6 is half of 12
9/14 because 7+2 is 9 and 5+9 is 14
Coefficient of sample = sample SD/mean * 100
So first to find Standard deviation(S)
S= sqrt(sum of (point - mean)^2)/(n-1)
S=6.7528
^use online calc
Next mean = sum of numbers divided by number of numbers
Mean = 31.6
^online calc again
So coefficient = (6.7528/31.6) * 100