5+ 4 * 2 + 6 – 2 * 2 - 1 add two different sets of parentheses to make the number 19 i already know (5 + 4) * 2 + 6 – 2 * 2 - 1 but i need one more you so much

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.