Answer:ed
Step-by-step explanation:
g
Answer:
18
multiply 7 and 3
reduce 15/5 to 3
subtract 21-3
(7)^2 +
2nd power means squaring a number and since you need to do that first, it goes in brackets.
(iii). (l-m+n)×(l+m-n)
(vi). (-a+5b)×(5a-b
