Twice the difference between x and k

Ana has one coin of 5 cents, one coin of 10 cents, one coin of 20 cents and one coin of 50 cents. how many different values can she make with these coins?

How many lines of symmetry does a butterfly have?

Where are the negative rational numbers placed on a vertical number line? A. to the left of 0 B. to the right of 0 C. above 0 D. below 0

A conservation biologist is observing a population of mule deer being affected by an unknown virus. Initially there were 125 individuals but the population is now decreasing by 4% per month.

Find two fractions that are not equivalent to 2/4 but that are equivalent to each other

Arianna wrote the expression 3x5 on her paper. andy wrote it as 5x3. what property is this an example of?

Suppose that in a certain triangle, the degree measures of the interior angles are in the ratio $2:3:4$. If the largest interior angle measures $x^/circ$, what is the value of $x$?

The music department of a department store sold 12 jazz CDs last month. Jazz sales during that month made up 2% of the music departments total sales. Determine the number of CDs that the store sold during that month

Two sides of a rectangular desktop are 3 feet long. The area of the desktop is 15 square feet. What's the perimeter of the desktop

Combine like terms. 8y2 + 8 (4y2 - 7) =