What is the equation of the parabola, in vertex form, given the vertex (-2,-1) and passes through point (-4,15)

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220