Liam invests £8000 in a savings account for 4 years. The savings account pays compound interest at a rate of: 4.5 % for the first year, 2.75 % for all subsequent years.

Work out the value of Liam’s investment at the end of 4 years.
Please help i don't understand

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that