Using the diagonals, determine whether or not ABCD is a rhombus? How do I show my work on this?

From a group of 8 people 5 will each win $1000. How many different winning groups are possible?

A rectangle has a length of 12 and an unknown width x. write expression for the permeter and area of rectangle

A card is drawn from a standard deck of 5252 playing cards. What is the probability that the card will be a heart and not a club? Express your answer as a fraction or a decimal number rounded to four decimal places.

My grandmother recipe for muffins calls for 4 tsp baking powder and 2.5 c of flour how much baking powder will be needed if i used 15 c of flour

Write 0.87 as a fraction in simplest form.

Zachery is solving the equation 3/4 (x - 8) = 12 Which is the best first step to begin to simplify the equation?

What are the solutions to 6x^2 - 5x - 4 = 0

What is x^2 = 2y when you have to make the subject x

How do I write this expression:The quantity seven plus Z, squared

If floor of a square office is 256 square units what is the perimeter