exam Maths Puzzle Numerical Ability

One common use of positive and negative exponents is in writing numbers as scientific notation. For example 0.000052 can be written as 5.2  10-5. A) Use scientific notation

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exam Other Question

if an object is thrown upward with an initial velocity of 64 feet per second from a height of 80 feet, then the height in feet t seconds after it is thrown is given by the function f(t)=-16t^2+64t+80
how long after it is thrown will it hit the ground? A square matrix A is idempotent if A^2 = A.

a) Show that if A is idempotent, then so is I - A.

b) Show that if A is idempotent, then 2A - I is invertible and is its own inverse.