Perform the following operation and express the answer in
scientific notation.
4.0x105 x 3.0x103
[ ? ]x10'?]

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Find the distance between (7,-6) and (-3,-9)

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.