the element born has two stable isotopes. boron-10 has an atomic mass of 10.0129 and a percentage in nature of 19.78% the atomic mass of boron-11 is 11.0093 and its percentage in nature is 80.22% what is the average atomic mass for boron?

Aparking lot is to be 400 feet wide and 370 feet deep. how many standard-sized cars fit in this lot considering a double-loaded (w4) two way traffic set up, an angle of 90° and a sw of 9’ 0’’? (do not consider handicapped parking spaces, and consider 15’ for turning aisles). show your work.

What is the range of the data below? .8090100

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?