Well to find out if they simplify to -1, work out the expression
A) -1(1-1)
simplify inside the parenthesis
-1(0)
anything times 0 is 0
B) -(-1)(-1)
this one simplifies to -1
C) <span>(− 1) + 1 − 1 (− 1)
PEMDAS
-1 + -1
2
then work from left to right
-1 + 1 is 0 plus 1 is 1
D)</span><span>− (− 1) − (− 1)(− 1)
PEMDAS so do Multiplication first
-(-1) is 1
1 - (-1)(-1)
-1*-1 is 1
1-1 is 0
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The answer to this question is B
Hope this helps :)
Equation:
f(x) = 2.10x + 5
Paid $49.10
2.1x + 5 = 49.10
2.1x = 44.1
x = 21
The distance between airport and Ann's home = 21 miles
It would be 15-5=10 that is because you subtract q3-q1
After 40 minutes, Ralph has already painted (40/60)/12=1/18 of the fence
Lisa's speed is 1/15 fence/hour, Ralph's speed is 1/12 fence/hour, hence when they help each other their combined speed is 1/15+1/12=3/20
Thus we need to solve 3/20*x=17/18 thus x=170/27 hours (approx 6 hours 15 mins)
20 / 2 1/3 = About 8.5
8 complete batches.
Hope I helped!
Best of luck! :)