​joey sold his old Surfboard for $85 he said 25% of the money to purchase a new Surfboard how much does Joey save for the new surfboard

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

What is the absolute value of the complex number -4-sqrt2i

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is: