Do anyone of you guys know where can i fine a real case study of lead poisoning I have a forensic science class can anyone help me

Super ultra mega important if you can answer this correctly i will give you 100 points but if you don't answer it correctly you'll get a big report. so stay aware and have a nice day!

Hannah is 3 years older than twice her brother joey’s age. joey is 2 years old. how old is hannah? show all of your work! the number of students is five more than seven times the number of teachers. there are 10 teachers. how many students are there? be sure to show all of your work!

If the scale factor between two circles is 2x/5y what is the ratio of their areas?