Write the explicit formula for the geometric sequence represented by the recursive formula
a1=4
an=5•an-1

How do i get the answer for 2/3 * 10/3

The ratio of two numbers is 5 to 4. the sum of the numbers is 99. what number is the greater of the two numbers?

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how