Which expression is equivalent to (4 7i)(3 4i)? â€""16 37i 12 â€"" 28i 16 â€"" 37i 37 16i.

Pls the last one and it has to be like number 6

Newtons second law says force(f) is equal to mass (m) times avceration (a) a scientist wamts to calculate the force of an objecy where the acceleration of gravity (g) is 9.8m/ s2 use the function to calculate the force of an object with a mass73( m) of 0.29 kilograms

What is the squate root of r^64 needa r^4 b r^8 c r^16 d r^32