The time, T (seconds), it takes for a pot of water to boil is proportional to the amount, A (litres), of water. It takes 320 seconds to boil 2.6 litres of water. Work out how long it takes (to the nearest second) to boil 2.2 litres.

step-by-step explanation:

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls