In ΔRST, m ∠ R = ( 5 x + 15 ) ∘ m∠R=(5x+15) ∘ , m ∠ S = ( 6 x + 8 ) ∘ m∠S=(6x+8) ∘ , and m ∠ T = ( 4 x + 7 ) ∘ m∠T=(4x+7) ∘ . What is the value of x ? x?

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