How do I slove 8n+7=31?

In a standard deck of cards find the probability of drawing a black card or a 10

What is the unit rate in dollars per hour for 1/2 and 1.25

What is the value of the underlined digit in 16,403

Huckleberries cost $5 a peck, whereas whortleberries cost $13 a peck. Hortense spent $109 for a total of 9 pecks. How many peck of whortleberries did she buy?

if the sin of angle x is 4/5 and the triangle was dilated to be two times as big as the orginal, what would be the value of the sin of x for the dilated triangle

If the x value is reapeted in a set of x values, is it a function? when finding a function do you loko at x values or y values?

Mean of 7,3,4,6,9,2,3,5,3

A random sample of 25 statistics examinations was taken. the average score in the sample was 76 with a standard deviation of 12.

Yesterday Nina's lunch cost 9.80 and she left a 1.47 tip. Today Nina's lunch costs 12.60. If she tops the same rate that she did yesterday, how much tip should Nina leave?

He moon forms a right triangle with the Earth and the Sun during one of its phases, as shown below: A right angle triangle is shown with the Earth at the right angle.