What are the different parts of the sat

How do you work out 21.3-8= show your working. plz

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?

Children learn the values, behaviors, and attitudes that will influence their lives through