Question

Using the formula P = 2(a + b), find a when P = 15 and b = 5.



2.5
5
8
10

Answer 1

given p=15 and b=5
we just have to replace the value of p and b in that formula
so now we get p=2(a+b)
=>15=2a+2.5
=>15-10=2a
=>5=2a
=>2a=5
=>a=5/2
a=2.5

Answer 2

just sub 15 in for p and 5 in for b and what do you get ?