exam Maths Puzzle Numerical Ability

Rewrite the middle term as the sum fo two terms and then factor completely

4z^3 - 18z^2 - 10z

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exam Other Question

Use the equation of the regression line to predict y when x = 20.

x 5 8 6 10 12 9
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y 18 20 15 25 30 25 18 men can do a work in 16 days.AFTER 3 DAYS 5 MEN LEFT. HOW MANY DAYS IT WILL TAKE TO GET THE REMAINING WORK DONE?