Can you show me the Bridges Mathmetics Grade 4 answer key?

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

2/3(-6y+9x) expand each expression using the distributive property

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g