Shopping provides a really good example of the value of estimation. Most people have a rough idea of how much they have to spend in a given shopping While you could pull out the old cell phone calculator and add up all of your purchases to the cent, who has time for that? Instead, it's helpful to round pri easy-to-use numbers and keep rough track of the total. Use this idea to estimate the total cost of the group of items. 2 Xbox games (regular price \( \$ 29.72 \) each, on sale for \( 50 \% \) off) 1 iPhone case ( \( \$ 18.68 \) each) 4 sets of headphones ( \( \$ 22.04 \) each) The total cost of the group of items is approximately \( \$ \)

101 : Calcola la lunghezza dell'arco di una cir- conferenza di raggio 25 cm corrispondente a un angolo al centro di \( 180^{\circ} \). [ \( 25 \pi \mathrm{~cm}] \)

Value: 3 A colon can show a connection between two clauses. True False \( \# 2 / 5 \)

3. \( \frac{\sqrt{a c} \cdot \sqrt{b c}}{5 \sqrt{a}-5 \sqrt{b}}+\frac{5 \sqrt{a}+5 \sqrt{b}}{5 \sqrt{a}+5 \sqrt{b}}= \)

The author of a reliable source is respected in his orTher field of study and will a. Provide contact information b. Cite materials used c. Try to sale you something d. Both "provide contact information," and "cite materials used."

Value: 4 True or False. Establishing credibility is important for a pathos paragraph. a. True, because nobody will believe you b. False, because emotions are the main motivators c. True, because logic is important d. False, because everyone already knows you're right \( \# 10 / 10 \)