Kevin built a compound machine
designed to lift a 1 kilogram load. He
tested the machine several times using a
can of sand as the load and a can of
sand for the input force. He added sand
to the input can until the machine lifted
the load. After running the machine
three times he calculates an average
efficiency of 72%. If two of his
calculations were 70% and 73%, what
was his third calculation?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤