D<x =8 18+6 is 24 and 24/3 is 8
A)
75% she knows for sure
Out of the remaining 25%, she has a 1/5 or 20% chance of getting it right. So,
1/4 x 1/5 x 100 = 5%
Total chance of getting a question right:
75 + 5 = 80%
b) If the total is 40, she can expect to get
80% x 40 = 32 questions correct.
<span>28/61</span>+<span><span><span>−3/</span>61i
lowest I could get it
</span></span>
Allow me to review before I start. Inconsistent means there's no solution to the system of simultaneous equations, i.e. parallel lines. Consistent means there's at least one solution. Independent and dependent apply to consistent systems. The former means exactly one solution (two lines in different directions which meet). Dependent means an infinite number of solution; the two lines are really the same line.
1. We have two different slopes, lines in two different directions, so they'll meet in exactly one place. That system is consistent and independent, the usual case.
2. We can write the first one y-3x= -2 and the second y-3x=+2. These are parallel lines that are different, so no solution: inconsistent.
3. The first equation is x+2y=4, same as the second. An infinite number of solutions. Consistent and dependent.
Calculating radicals can be difficult if they don't work out. To calculate a radical that doesn't work out, you can estimate by finding which two perfect square roots it lies between. You can also use a calculator.
An alternative solution, using properties of square roots is where 
Using this, we can create 
. This is between the perfect square 9 and 16 (3 and 4).
