Use the laplace transform to solve the given initial-value problem. y" – 3y + 2y = 8 (t-1), y(0) = 0, y (0) = 0 • y(t) = (e24 – et-1) u (t - 1) © y(t) = (e2t +et+1) u(t-1) y(t) = (e24-2 +et-1) u (t – 1) y(t) = (e2t-2 – et-1) u(t - 1)

Acompound is found to contain 6.1% hydrogen and 93.9% oxygen. find it’s empirical formula.

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)