How many strings of eight uppercase english letters are there that start with x, if no letter can be repeated?

The circumference of a circle is 5 pi cm. what is the area of the circle?

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"