I can help you! Just let me how what the questions are
x = longer section
y = shorter section
x + y = 109
x = 2y + 10
so we sub in eq 2 into eq 1
2y + 10 + y = 109
3y + 10 = 109
3y = 109 - 10
3y = 99
y = 99/3
y = 33 <=== shorter section is 33 cm
x = 2y + 10
x = 2(33) + 10
x = 66 + 10
x = 76 <=== longer section is 76 cm
Ratios are proportional if they represent the same relationship. One way to see if two ratios are proportional is to write them as fractions and then reduce them. If the reduced fractions are the same, your ratios are proportional.
Rewrite 13/40 as a fraction over 100:
13/40 = (2 • 6.5)/(2 • 20) = 6.5/20
6.5/20 = (6.5 • 5)/(20 • 5) = 32.5/100
32.5/100 = 0.325
which clearly terminates.
