Write a program that asks for the number of units sold and computes the total cost of the purchase. Input validation: Make sure the number of units is greater than 0. Use output (stream) manipulators: 2 digits after the decimal point g

3(c). is the following command correct? if not, correct the syntax and explain your answers. you can just rewrite/correct only the wrong parts. (4) select p#, city, zipcode, count(*) from client c, property p, viewing v where c.c# = v.c# and v.p# = p.p# group by p#, city having count(*) > 3;

Convert and simplify the following sentences to conjunctive normal form (cnf): (a) (p → (q → r)) → (p → (r → q)) (b) (p ∧ q) → (¬p ↔ q) (c) ((p → q) ∧ ¬q) → ¬p

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health? a. air quality data gathered by new instruments can be used to reduce exposure to pollutants. b. new technologies enable natural and human-made pollution sources to be located and monitored. c. air quality data gathered by new instruments can be used to predict trends in pollution over time. d. new technologies allow governments to make informed decisions about the regulation of pollution. (choose more than one)