-15+4/5 (15e-10)-10e

2e+23
2e-23
-2e+23
-2e-24

The expression -15+4/5 (15e-10)-10e simplifies to:

-15 + (4/5) * (15e-10) - 10e

= -15 + (4/5) * (15 * 10^(-10)) - 10e

= -15 + (4/5) * (1.5 * 10^(-9)) - 10e

= -15 + (4/5) * 1.5 * 10^(-9) - 10e

= -15 + (4/5) * 1.5 * 10^(-9) - 10e

= -15 + (0.6 * 1.5 * 10^(-9)) - 10e

= -15 + (0.9 * 10^(-9)) - 10e

= -15 + 9 * 10^(-10) - 10e

= -15 - 10e + 9 * 10^(-10)

Therefore, the simplified expression is -15 - 10e + 9 * 10^(-10).