Evaluate -4a+8z if a=8 and z=3

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

(x-5)1/2+5=2 what is a possible solution?