Solve for x: two sevenths(x − 2) = 4x

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Graph the line with the given slope m and y-intercept b. m=-3,b=1