find the side lengths and perimeter of triangle JKL if necessary round your answers to the nearest hundreth

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!