Q: What will the keystrokes ‘1 <RET> 2 <RET> 3 <RET> 4 + * -’ compute?
A: 1 - (2 * (3 + 4)) = -13
Q: Compute ‘2*4 + 7*9.5 + 5/4’ using the stack.
A: 75.75
Q: Suppose the numbers 10, 20, and 30 are on the stack. Figure out how to add one to the number in level 2 without affecting the rest of the stack. Also figure out how to add one to the number in level 3
A: TAB (‘calc-roll-down’) and M-TAB (‘calc-roll-up’)
Q: To enter the complex number ‘(2, 3)’, your friend Joe typed ‘( 2 , <SPC> 3 )’. What happened? (Joe thought of a clever way to correct his mistake in only two keystrokes, but it didn’t quite work. Try it to find out why.)
A: TAB DEL or simply M-DEL (‘calc-pop-above’)
Q: How could you get the same effect as pressing ‘Q’ but using an algebraic entry instead? How about if the ‘Q’ key on your keyboard were broken?
A: ’ sqrt($) RET
Q: Joe entered the formula ‘2 x y’, stored 5 in ‘x’, pressed ‘=’, and got the expected result, ‘10 y’. He then tried the same for the formula ‘2 x (1+y)’, expecting ‘10 (1+y)’, but it didn’t work. Why not?
A: x is interpreted as a function name, use 2 x*(1+y).
Q: What result would you expect ‘1 <RET> 0 /’ to give? What if you then type ‘0 *’?
A: div 0 error
Q: Your friend Joe tried to enter one-third as ‘3#0.1’ in ‘d r 3’ mode with a precision of 12. He got ‘3#0.0222222…’ (with 25 2’s) in the display. When he multiplied that by three, he got ‘3#0.222222…’ instead of the expected ‘3#1’. Next, Joe entered ‘3#0.2’ and, to his great relief, saw ‘3#0.2’ on the screen. But when he typed ‘2 /’, he got ‘3#0.10000001’ (some zeros omitted). What’s going on here?
A: