Need help please How many months will it take for 500 grams of Arsenic in soil to reduce
to 100 grams, if the half-life is 78 months?

Dear User,

Your answer is 100 g of Au-198 would have a half life of 2.7 day.

Hope it helped... pls mark brainliest

AB = RS , BC = SP , CD = PQ , AD = RQ

m∠A = m∠R ,  m∠B = m∠S ,  m∠C = m∠P ,  m∠D = m∠Q

Step-by-step explanation:

∵ Trapezoid ABCD is congregant to trapezoid RSPQ

∴ AB = RS

∴ BC = SP

∴ CD = PQ

∴ AD = RQ

∴ m∠A = m∠R

∴ m∠B = m∠S = 90°

∴ m∠C = m∠P = 90°

∴ m∠D = m∠Q