890.50/6850 = 0.13
0.13 * 100 = 13%
The commission rate is 13%
a4 - 3a2 - 1
step 1 :
equation at the end of step 1 :
((a4) - 3a2) - 1
step 2 :
trying to factor by splitting the middle term
2.1 factoring a4-3a2-1
the first term is, a4 its coefficient is 1 .
the middle term is, -3a2 its coefficient is -3 .
the last term, "the constant", is -1
step-by-step explanation: the answer is a due to the rule of symmetry; that a line of symmetry must divide a figure into 2 pieces that are the exact same, only reflected over a line of symmetry. b and c do not have lines of symmetry and would not divide the figure evenly, thus making the answer a.