How do I work this

- (-3) - [ - (-4]-2+7

Prove that's the decimal number 9.86 is a rational by finding its fractional form

Solve. {d+e=2 {d-e=4 Use the substitution method. There are an infinite number of solutions. There is no solution. The solution is (5, 1). The solution is (3, - 1).

If i^2=-1 and (4+2i) (6-ki) = 30, what is the value of k?

Tom purchased a bag with 12 apples in it. On Monday the ate 2 2/3 apples, on Tuesday he ate 3 1/4 apples, and on Friday he threw away 4 7/8 apples. What is the total amount of apples Tom bowl has left?

13x-6y=22 x=y+6 find x and y

How do I prove the corresponding angles theorem?

Ben thought an assignment would take 20 minutes to complete. It took 35 minutes. What is the percent error in his estimate of the time?

Three less than the product of 8 and a number is equal to 6

Using the diagonals, determine whether or not ABCD is a rhombus? How do I show my work on this?

Factor 2n (n + 3) - 5 (n + 3). A. (n + 3) (2n - 5) B. (n + 3) (2n + 5) C. cannot be factored D. (n - 3) (2n + 5)