Answer:The amplitude:30
so a:-30
the period is:12
so b: pi/6
Step-by-step explanation:
I think A) 117 km2 should be correct
If we simplify like terms on left and right sides we gwt
16x + 9 = 4x
Its B
Oldest = 2x
Middle = x + 5
Youngest = x
2x + x + 5 + x = 57
combine like terms
4x + 5 = 57
subtract 5 from both sides
4x = 52
divide both sides by 4 to isolate x
x = 13
Oldest = 2x = 2(13) = 26
Middle = x + 5 = 13 + 5 = 18
Youngest = x = 13