Answer:
110
Step-by-step explanation:
They’re adding the two numbers and putting zero at the end
and since we know now what "x", let's use that in either equation, say the first equation,
another way to do it is by "elimination", depending on the equations, one way may work quicker than the other, in this case, substitution was the simpler one, because the first equation is already solved for "y", so we just grabbed it and plugged it in the 2nd equation.
This is a combination in which you choose 4 from 10.
The formula is
combinations = 10! / 4! * (10-4)!
combinations = 10! / 4! * 6!
combinations = 10 * 9 * 8 * 7 * 6! / 4! * 6!
combinations = 10 * 9 * 8 * 7 / 4 * 3 * 2
combinations = 10 * 3 * 7
combinations = 210
Source:
http://www.1728.org/combinat.htm
If 1cm equals 1000 millimeters, then multiply 7 by 1000 and you will get your answer. 7 times 1000 equals 7,000 millimeters.
7*1000
Multiply
Final Answer: 7,000
She now has $300 in her account
