exam Maths Puzzle Numerical Ability

find a 2 digit number whose tens digit is 3 less than the units digit. The
orginal number is 6 more than 4 times the sum of the digit

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exam Other Question

The difference of two integers is 9. Five times the smaller is 7 more than three times the larger. Find the numbers. can someone help me with this problem:

Which of the following is a reflection of f(x) = -x + 1 about the x-axis?

a. r(x) = x + 1
b. r(x) = x - 1
c. r(x) = -(x - 1)
d. None of the above