book Maths Puzzle Numerical Ability

(4,a)(1,6);d=5 i dont get how to work them out

Read Solution (Total 0)

book Other Question

im trying to figure out what i need to make on my last exam to get a 77 as my final grade. my first 3 exams i got an 82, a 60, and an 80. Each are 24% of my grade. The last exam is -12q+4=8q-6