0.4% = 0.04
0.04 * 1000 = 4
the answer is 4 hope I helped you out!
2.5x10^3 I think. Exponents are subtracted. The number you're multipliying by has to be more than one.
The formula for a quadratic function is y=ax^2+bx+c.
The vertex is h, k. This can be found by evaluating y to get k, and dividung -b by a in order to get h.
Hope this helps!