LET X = BALLOON * 64 

Half of a Balloon

BALLOON	X	Y
1	64	100
2	128	100
3	192	100
4	256	100
...	...	...
10	640	100

Here is the completed program

' Draw 10 Red Balloons
SCREEN 12     ' start up graphics
COLOR 4       ' set the pen color to red
'
LET BALLOON = 1              ' start with balloon number 1
DO WHILE BALLOON <= 10       ' end with balloon number 10
  LET X = BALLOON * 64       ' calculate an X for this balloon
  CIRCLE (X, 100), 25        ' draw a balloon
  LET BALLOON = BALLOON + 1  ' go on to next balloon
LOOP
'
END

 

Each balloon has a radius of 25. The balloons are drawn in a row with all their centers at Y=100. Each balloon is 64 pixels to the right of the previous one. The table shows this. The last balloon (number 10) has its center at (X=640, Y=100). This is the location of the right edge of the screen, so half the balloon is cut off.

Above is what the program draws on my system (reduced in size). To see the program's output in a window (as here), press ALT-ENTER when the program is showing the graphics screen. When you are done looking at graphics, press ALT-ENTER again.