3. จงแสดงว่าประพจน์ \( p \rightarrow(\sim q \rightarrow p) \) กับ \( (\sim p \vee(\sim q \wedge p)) \) เป็นประพจน์ที่สมมูลกันหรือไม่ 4. จงตรวจสอบว่า \( (p \rightarrow \sim q) \vee(q \rightarrow \sim r) \) เป็นสัจนิรันดร์หรือไม่

Questlon 7 of 10 How do the planets farther from the Sun differ from the planets that are closer to the Sun? A. They are spherical in shape. B. They have moons. C. They orbit the Sun. D. They are colder.

Which is a drawback of agricultural technology? A. People can communicate better. B. Some pests are killed. C. Some dangerous chemicals are used. D. More food is produced.

Dire pour chaque signal s'il est périodique, si oui déterminer la période a) \( x(t)=e^{-2 t} \cos (2 \pi t) \) b) \( x(t)=\cos ^{2}(2 \pi t) \)

Questlon 24 of 25 What is usually organized in a chart during an experiment? A. Data B. Explanation C. Hypothesis D. Claims

Questlon 11 of 25 What is the best way to test a claim made on a product label? A. Assume the claim is true. B. Ask the company who makes the product. C. Set up a control group and an experiment group. D. Use an experiment with no responding variables.