PLEASE HELP ASAP
The equation y=2.54x can be used to determine the number of centimeters, y, in a given number of inches, x. The equation was used to fill in the table below.
What value is missing from this table.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

How many heads would you expect if you flipped a coin twice? first, fill in the table below with the correct probabilities. hint: the sample space for flipping a coin twice is {hh, ht, th, tt}. a = b = c = f

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)