How would you find a fraction of a circle that an arc covers

Rewrite the hyperbolic equation 4y^2 -9x^2 +54x-8y-113=0

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?