All you have to do is:
Make all of your fractions to common denominator.
Then, you add 8 3/10-1 2/5- 2 1/3+ 4 3/5
And when you solve it, you get 9 5/30 and when you simplify it,
You get 9 1/6 yards of ribbon
The percentage of the bags of cement that would weigh less than 50 lbs. would be 50% because the normal distribution is symmetrical, and since the mean is your midpoint, then it would be 50% higher, and 50% lower.
By the law of cosines, the angle
satisfies
which reduces to
which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).
An equation says that two things are equal. It will have an equals sign "=" like this:
<span>7 + 2 = 10 − 1</span>