The difference between a number and 10 is multiplied by 2. the answer is 6. what is the equation that represents this information

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Suppose a man is heterozygous for heterochromia, an autosomal dominant disorder which causes two different‑colored eyes in an individual, produced 25‑offspring with his normal‑eyed wife. of their children, 15 were heterochromatic and 10 were‑normal. calculate the chi‑square value for this observation.

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