What is 8 and 21/40 as a decimal

Determine whether the samples are independent or dependent. upper a data set includes the morning and evening temperature for the lasta data set includes the morning and evening temperature for the last 90 days.90 days.

This figure consists of a rectangle and semicircle. what is the perimeter of this figure use 3.14 for pi 60.84m 72.84m 79.68m 98.52m

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base