book Maths Puzzle Numerical Ability

A = 1/2h(B+b)

area of a trapezoid

solve for b

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book Other Question

Mephis, Tennessee, is growing ata rate of 0.36% per year. Find how long, to the nearest tenth of a year it will take an initial population of 650,000 to increase to 700,000. Use the population growth formula y= y0e^kt I have problems working with multi-step equations, can you help me please?
Thank you!