Maths in Science

An object is thrown vertically upwards with an initial velocity of 20 m/s. Its height h(t) in meters after t seconds is modeled by the quadratic function h(t) = -5t+ 20t. After how many seconds will the object hit the ground?

You have 200 grams of a 10% saline solution. How many grams of pure salt must you add to increase the concentration of the solution to exactly 20%?

A colony of insects triples its population every 4 days. If the initial population is 100 insects, which mathematical model represents the population P(d) after d days?

Two forces act on a single point at a right angle 90° . Force A is 6 N and the magnitude of the resultant net force is 10 N. What is the magnitude of Force B?