3. Simplify the expression 5a - 4b - 2[a - (2b + c)]​

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18