How do you calculate a area of a compound shape and not confuse yourself while working out the area?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?