What is the best order-of-magnitude estimate for 789,000?

A.

10^7

B.

10^6

C.

10^5

D.

10^4

Henrique began to solve a system of linear equations using the linear combination method. His work is shown below: 3 (4x - 7y = 28) → 12x - 21y = 84 - 2 (6x - 5y = 31) → - 12x + 10y = - 62 12x - 21y = 84 + - 12x + 10y = - 62 - 11y = 22 y =

2x-5y=15 -2x-3y = - 23

Which Mathmatical property is demonstrated? 5•7•4=5•4•7

Stacey's text messaging plan charges 25¢ for each message over 35 in addition to a $12 base charge. If she owes $59.75 for text messaging in the month of February, how many text messages did she send that month?

Zöe schedules advertising for a radio station. She must fill 12 minutes each hour with 30 second ads and 60 second ads. Zöe sold twice as many 60 second ads as she did 30 second ads.

A rental company charges $75 a day and 20 cents a mile for renting a truck. michael rents a truck for 2 days, and his bill came to $238. how many miles did he drive?

There are 3 quadrants on a coordinate plane? A. True B. False

4x squared + 3x-2 divided by 5x squared + 8x + 3

3x²-36x+81=0 i need the answer

A train moved at a speed of 90 miles per hour for 2hours and then slowed down to 72 miles per hour. A) Find the total number of miles the train traveled. B) Calculate the average speed of the train.