76 .
If b(x+2y)=60 & by=15, What is the value of bx?
A.20
B. 25
C. 30
D.45
View AnswerAns: 30
77 .
xy+z=y, What is x in terms of y and z?
A.y+z/y
B. y-z/y
C. 1-z
D.z-y/y
View AnswerAns: y-z/y
78 .
1/p+q = r & p is not equal to -q, what is p in terms of r &q ?
A.rq-1/q
B. 1+rq/q
C. r/1+rq
D.1-rq/r
View AnswerAns: 1-rq/r
79 .
If a-b=p & a+b=k, then a^2 - b^2 =
A.pk
B. p^2 - k^2
C. p+k
D.p^2/k^2
View AnswerAns: pk
80 .
xy/x+y = 1 & x is not equal to y, what is x in terms of y?
A.y+1/y-1
B. y+1/y
C. y/y-1
D.y/y+1
View AnswerAns: y/y-1