Let R be the relation on N x N defined by (a, b) R (c, d) if and only if ad bc. Show that R Equivalence Relations. is an equivalence relation on N x N.

An angle measures 22° less than the measure of its supplementary angle. What is the measure of each angle?

Compute Δy and dy for the given values of x and dx = Δx. (Round your answers to three decimal places.). y = 2x - x^2, x = 2, Δx = - 0.6. Find: Δy and dy

Five fourth of a right angle

Write an expression, using the variables w and d, to represent the sum of the number of hours in w weeks and d days

The height of a stack of 12 pennies is 18.24 millimeters. What is the thickness of each penny.

What does the equation y = x2 represent as a curve in the set of real numbers2?

The printer charges $4 per book to print it, and you spent $3500 on advertising. you sell the book for $15 a copy. How many copies must you sell so that your income from sales is greater than your total cost?

A roller coaster can accommodate 346 rider in 20 minutes. How many riders could ride in 90 minutes?

You have $12 to buy five goldfish for your new fish tank. Write and solve an inequality that represents the prices you can pay per fish.

Adam has 16.45 kg of flour, and he uses 6.4 kg to make hot cross buns. The remaining flour is exactly enough to make 15 batches of scones. How much flour, on kg, will be in each batch of scomes?