2.3) Suppose A, C A2 C …· are o -algebras consisting of subsets of a set X. Is U, A¡ necessarily a o – algebra? If not, give a counterexample.

A row of grassed seating at an amphitheater has been marked out to define 25 spaces of equal width that can be booked for an event, the row is 20m long. If s represents the width in metres of one space, express this as an algebraic equation, do not simplify your equation, use whole numbers in the equation. Observe algebraic conventions, do not include brackets or units in your equation: Use your algebraic equation to find the width of each space, s. Your answer should be a numerical value to 2 decimal places, give your answer in the same units used in the question, include units and no spaces in your answer: S=

Summarize two methods for determining the area of a trapezoid. How are these methods the same and how are they different in terms of what you had to think about when executing them? Your summary should be written in your own words. Be sure to explain it in a way that elementary students can understand and use examples. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B I U Ꭶ Paragraph v Arial 응용 ≡ 三星 图 {} x² X₂ KA + 10pt »¶¶< T +] ABC ✓ Ev AV ¶T AV ΠΩΘ. Tx 田く x G ...

Please solve these questions. Show all work and steps so I am able to understand. DO NOT USE CALCULATORS OR GRAPHING. Must be solved by hand. Thank you!!