exam Maths Puzzle Numerical Ability

Fine the tenth term of the sequence 5, -25 , 125, -625........help me please

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exam Other Question

A rodent population has moved into a new commercial development area in the city. The population initially had 16 animals and displayed an exponential rate of growth. After 486 wee what is the slope-intercept equation form of the line with the x-intercept=-3, y-intercept=2? thank you!