Could someone help me with this question please!

X:y = 5: 3 and x + y = 56
Work out the value of x-y

What is the solution of log2  (3x  -  7)  =  3? 4 5

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *