Soil erosion can be slowed by
a. no-till farming
c. plowing at least three times a year
b. cutting trees from the middle of fields
d. farming on steeper slopes

The answer is a. no-till farming

It's common in agricultural industry to prepare its soil by using mechanical agitation such as digging, stirring, and overturning which could cause soils disturbance and make it prone to erosion

in no-till farming, they use no such thing, which increase the matter retention and cycling of nutrients in the soil

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2