exam Maths Puzzle Numerical Ability

How many bushels from a mixture that is one third oats must be added to 480 bushels of mixture of corn and oats which is 75% corn in order to get a mixture which will be 30% oats?

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exam Other Question

.State the domain and explanation of the following
a. f(x)=square root of (x+4)
b. g(x)=2x+1/x-7
c. h(x)= 3x^2+5x-3
d. l(x)=2x+3
e. m(x)=3/x^2+7 I wasn't sure where to categorize induction but I'm really confused on these two questions.
1) Using the Principle of Mathematical Induction, verify that
For every integer n &