56 million in scientific notation

Simplify the following expression into the form a+bi where a and b are rational numbers (3+7i) (-2-2i) - 4i (5-9i)

John averaged 82 out of 100 on his first three tests. What was John's score on the fourth test if his average after the fourth test dropped to 79 out of 100?

1 over 8 added 5 times equals

Carly, sandi, cyrus and pedro have multiple pets. carly and sandi have dogs, while the other two have cats. sandi and pedro have chickens. everyone except carly has a rabbit. who only has a cat and a rabbit?

How do i put - 2 + 5 on a number line and what is the answer.

Do the ratios 19 / 20 and 6 / 15 form a proportion?

Three burgers and two orders of French fries cost $24. Five burgers and one order of french fries cost $33. What is the cost of one burger? What is the cost of one order of French fries?

Lorea is designing the top of a quilt which measures 2,160 square inches. Triangles will cover 432 square inches of the quilt, and squares will cover 180 square inches.

In a psychology class, 55 students have a mean score of 97.6 on a test. then 18 more students take the test and their mean score is 70. what is the mean score of all of these students together? round to one decimal place.

If driver A has 145.155 average speed and driver C has a average speed of 144.809 and driver D had a speed between A and C Write a possible speed for D