A12 foot ladder leans against a wall, making an angle of 40° with the horizon. how far is the base of the ladder from the wall?

the base of the ladder is 18ft away from the wall

The decrease of the decimal rate -1.05 mm/year can be rounded to -1. You don’t need to round 2.48 because you’re multiplying by -1. Since -1.05 is negative and rounded to a greater value, the estimate could be adjusted to a slightly lesser value, maybe -2.5 or -2.6.