(a) A certain solution has a hydrogen ion concentration of 2.21 x 10-4 moles per liter. Write this number in standard notation. (b) A fin whale can weigh up to 260,000 pounds. Write this number in scientific notation.​

Solve |2x - 5| = 4 if anyone could , that would be great

This stem-and-leaf plot represents the heights of the students on ralph's basketball team. one student's height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.

Which expression is equivalent to (4 +6i)^2? ? -20 + 48i 8 + 12i 16 - 36i 20 + 48i