Ken is a S4 student and he has to take one subject from Group I (including Physics, Chemistry
and Biology) and one subject from Group II (including Geography, Economics, Accounting and Visual Arts) for his study programme.

(a) In how many ways can he choose for his study programme?
(b) Furthermore, if all the subjects offered can be taught in Chinese or English, in how many ways can Ken choose for his study programme?

You are updating your garage and the only thing left to paint is your garage day. you're only going to paint the slide that faces the street. the garage door is 9 fert 8inches tall and 120 inches wide. you need to know the surface area of the side of the garage door to determine how much paint to buy. the hardware store sells paint by how much covers a square foot. what is the surface area you should report to the hardware store what is the answer

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.