3. Which register(s) must be preserved by function f1 before it calls function f2? (a) $t1 (b) $t2 (c) $s0 (d) $s0 and $s1.

If a =6, what is the value of 2a(3b + 5c)?

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Which statements regarding the diagram are true? check all that apply.