4x^2 + kxy - 9y^2

How to solve for k?

A bag contains white marbles and yellow marbles, 45 in total. The number of white marbles is 5 less than 4 times the number of yellow marbles. How many white marbles are there?

Given that the measurement is in centimeters, find the area of the circle to the nearest tenth. (Use 3.14 for n) Radius is 3

Island A is 160 miles from island B. A ship captain travels 220 miles from island A and then finds that he is off course and 200 miles from island B. What bearing should he turn to, so he is heading straight towards island B?

Greta has a piece of cloth that is 9 yards long. She cuts it into pieces that are each 1/3 yard long. How many pieces of cloth does Greta have now?

Word problem for (2t+5) - t=26

Why can't the expression 13x+10 be factored

List two ways a rectangle and a square are alike

In which of the following situations would it NOT be wise to estimate? a. the number of miles per gallon an automobile can provide b. the time it would take to walk to the grocery store from home c. the amount of food to prepare for twelve people d.

Find the absolute value if the complex number 2.5 + 2.5i. 3 3.5 3.04 3.54

A bike cost $200 but is reduced by 30% in a sale. how much is the bike reduced by? what does it cost in the sale