A:b = 9:4 and 10b = 7c
work out a:c in its simplest form

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Enter numbers to write 0.000328 0.000328 in scientific notation. 1 1 0.000328=3.28 × 0 . 000328 = 3 . 28 × =3.28×10 = 3 . 28 × 10