Solve these equations fast.

(6 + 3i) (6 - 3i) =

(4 - 5i) (4 + 5i) =

(-3 + 8i) (-3 - 8i) =

is perpendicular to. How many 90° angles are formed by the intersection?

What is 7/10 minus 1/2?

Your job is to sort and stack marbles for sale. a bag contains 55 marbles, some red and some green. if there are 11 red marbles, what is the ratio of red to green marbles

byrons income last year was $61,700. he made $48,000 at his plumbing job and had income from an apartment that he rented out. If byron earned the same amount of rent each month for the entire uear approximately how much per month did he make

A trunk measures 48 inches long, 22 1 half feet wide, and 32 inches high. What is the volume of the box?

What is pi times 4 squared times 7

What is 8.49x10^-7 in decimal form? 0.0000000849 0.000000849 8,490,000 849,000,000

Travel Ez sells dollars at a rate of ($1.40) / (1 euro) and buys dollars at a rate of ($1.80) / (1 euro). At the beginning of a trip, Sophie exchanged $540 to get 300 euros.

What is the range of y = square root x+7+5?

Is to a solution of the equation 3x+6=6x?