Can someone answer 9,10,11,&12 i’ll give brainleset

Which expression converts 45 degree to radians

Combine like terms to make a simpler expression 3z+z

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.