Principal: \( \$ 17,200 \) Interest rate: \( 6 \% \) Compounded quarterly Calculate the effective rate (APY) of interest for 1 year. (Use the Table provided.) Note: Do not round intermediate calculations. Round your final answer to the nearest hundredth percent.

You deposit \( \$ 1000 \) each year into an account earning \( 3 \% \) interest compounded annually. How much will you have in the account in 25 years? \( \$ \)

4) Modélisation du bénéfice : Soit \( b \) la fonction définie sur \( [1 ; 5,5] \) par : \( \quad b(x)=a(x)-c(x) \). a) Que représente \( b(x) \) ? b) Calculer et simplifier \( b(x) \). c) Pour quels prix de vente unitaire d'un séjour l'agence réalisera-t-elle un bénéfice ? On pourra utiliser la calculatrice graphique pour répondre à cette question.

If \( x \) represents the number of items produced, (a) write a cost function, (b) find a revenue function if each item sells for the price given, (c) state the profit function, (d) determine analytically how many items must be produced before a profit is realized (assume whole numbers of items), and (e) support the results of part (d) graphically. The fixed cost is \( \$ 500 \), the cost to produce an item is \( \$ 20 \), and the selling price of the item is \( \$ 45 \). (a) The cost function is \( \mathrm{C}(\mathrm{x})=\square \). (Simplify your answer. Do not factor.) (b) The revenue function is \( \mathrm{R}(\mathrm{x})=\square \). (Simplify your answer. Do not factor.) (c) The profit function is \( \mathrm{P}(\mathrm{x})=\square \). (Simplify your answer. Do not factor.) (d) At least \( \square \) items must be produced before a profit is shown. (Type a whole number.) (e) Choose the correct graph to the right.

A family has a monthly income of \( \$ 3100 \) and plans to spend \( 7 \% \) of this amount on entertainment. How much will be spent on entertainment? The family will spend \( \$ \square \) on entertainment.

Who can save money to buy a house?