\( A \cup B ) ^ { C } = A ^ { C } \cap B ^ { C } \)

How much would you need to deposit in an account now in order to have \( \$ 4000 \) in the account in 10 years? Assume the account earns \( 8 \% \) interest compounded monthly.

1) Caloular os catetos de um triangulo retangulo cuia hipotenusa mede 6 cm e um dos ángulos mede \( 60^{\circ} \)

Simplify. Use positive exponents for any variables. \( \frac{2 x^{-8} x^{3}}{x^{-5}} \)

An apple farm yields an average of 33 bushels of apples per tree when 19 trees are planted on an acre of ground. Each time 1 more tree is planted per acre, the yield decreases by 1 bushel (bu) per tree as a result of crowding. How many trees should be planted on an acre in order to get the highest yield?

Erin and Max bought petrol from different petrol stations. a) Was Erin's petrol or Max's petrol better value for money? How much would 30 litres of petrol cost from the cheaper petro station?