A metal alloy weighing 4 kg and

containing 90% gold is melted and mixed

with 1 kg of a different alloy which

contains 30% gold. What percent of the

resulting alloy is gold?

A) 78% B) 90%

C) 32% D) 50%

i believe it's B  

Step-by-step explanation:

y-1700=200(x+4)

step-by-step explanation:

200(x+4) is 200x + 800 she is saving 200 per week x is the weeks and the -1700 is. us that’s howmuch she already had

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base