Change 8.6 x 10^-4 to decimal notation

For a normal distribution, what z-score value separtes the lowest 20% of the distribution from the highest 80%?

Whats equivalent to 18/4?

Amber earned $14.50 babysitting on Saturday. On Sunday, she spent $6.95 when she purchased a movie ticket. She needed to borrow money from a friend to complete her purchase of a snack.

What is 3divided by 1000 divided by5

What value of x makes this equation true? 1.2x+5=0.9+10

Find x when y=3 in the literal equation 3x+6y=24

The sequence below is arithmetic {1,8,27,64}

Angles α and b are the two acute angles in a right triangle. Use the relationship between sine and cosine to find the value of b if b < α. sin (x 2 + 2x) = cos (2x + 3x 2)

Kevin has mowed 40% of the lawn. If he has been mowing for 20 minutes, how long will it take him to mow in a hour?

How to solve - x^2-2x=5?