book Maths Puzzle Numerical Ability

if f(x)=4x-3, find the following (solve it for a numerical answer):
f(-1)

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book Other Question

Dr. Mento has a class of 80 students. For a group project, she wants to divide the students into groups of 6, 8, or 10. Is this possible? Explain your answer. The difference between two numbers is 4. Twice the larger number is 11 more than 3 times the smaller number. Find the numbers.