1) 50x30
2) 2000+409
3) 500+800
Answer:
54
Step-by-step explanation:
to evaluate substitute b = 18 into 3b
3b = 3 × 18 = 54
Less, 12 x 3/4 is 9 as you take 12/4 which is 3 times 3, which gives you 9
Answer:

Step-by-step explanation:
(r⁻⁷)⁶ = r⁽⁻⁷⁾ˣ⁶
= (r)⁻⁴²