When 3+4i2+i is expressed in the form a+bi, what is the value of a?

Prove that every rational number and every root of a positive rational number are algebraic numbers.

Can you explain why there is 7 places in 50 million?

What ratio correctly compares the measurements 24 months to 3 years? Drag and drop the appropriate numbers into the boxes to show the ratio in the simplest form.

Solve for the variable 7/28 = 25/?

What is the solution to this system of equations? x+3y-z=64x-2y+2z=-106x+z=-12

A certain disease has an incidence rate of 0.2%. If the false negative rate is 8% and the false positive rate is 4%, compute the probability that a person who tests positive actually has the disease.

How many 4-element subsets containing the letter a can be formed from the set {a, b, c, d, e, f, g}?

A safety inspector conducts air quality tests on a randomly selected group of 7 classrooms at an elementary school. Identify the population and sample in this setting.

A square has an area of 15in^2. what is the approximate side lengths of the card

In class, we used associative property to show that when 6 is a factor, then 2 and 3 are factors, because 6=2x3. Use the fact that 10=5x2 to show that 2 and 5 are factors of 70, 80, and 90.