Algebra problems 40..49


to problems 30..39

to problems 50..59

40.
Solve x in:
(base of logarithm is 10)





41.
If:



calculate x-y



42.
Below squares are pictured.
The red area is 20.
How big is the blue area?.





43.
find values of x satisfying:





44.
Calculate the value of





45.
Calculate:





46.
Find x if :
    5log(x+3) = 6log(x+14)


47.
If



calculate





48.
x + y = 2
x5 + y5 = 82

Calculate x and y



49.
For which values of x is true: