exam Maths Puzzle Numerical Ability

How do you describe the right-hand and left-hand behavior of the graph of the polynomial function of f(x)= 2x^5-5x+7.5

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exam Other Question

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?
A). $11,000

B). $12,000

C). $8,000

D). $13,000 Solve each system of equations. Check by substitution

3a + 4b = -12
4a - 5b = -16