Question

Mark’s garden is a rectangle that is (4a+96)/(a+15) meters long and (4a+24)/(a+15) meters wide.

Answer 1

ℓ: (4a + 96)/(a + 15) 

w: (4a + 24)/(a + 15) 


p = 2 * { ℓ + w } 

p = 2 * { [(4a + 96)/(a + 15] + [(4a + 24)/(a + 15)] } 

p = 2 * { [(4a + 96) + (4a + 24)] / (a + 15) } 

p = 2 * { (4a + 96 + 4a + 24) / (a + 15) } 

p = 2 * { (8a + 120) / (a + 15) } 

p = 2 * { 8.(a + 15) / (a + 15) } 

p = 2 * 8 

p = 16 m 


The section is 50 cm, i.e. 0,5 m: 

= 16/0,5 

= 32