Is the square root of 87 rational of irrational?

)a smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth). what is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm)

John bought 5 lemons and used 2 of them for a salad how much did he use for. a salad . he used % of the lemons.

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)