evaluate
f=x²y²+z²+x.z²+y²x
(1/3)^-2+(1/4)^-2+(1/2)-2
20/35/9
if 20 men working 7hours can complete a work in 10 days. in how many days does 15 men working 8 hours a day can complete it.
15a + 30b + 7a – 12b
2053471
2061758
2063172
(8^-1*5^-1)^-1
1413/20
For what value of k the system of equations has a unique solution? x - ky = 2 and 3x + 2y = -5
