Which pair of equations represents two perpendicular lines?

1. 2x-5y=45 and y-5/2x=-9

2.-3x+2y=10 and 3y=-2x+12

3.7x+4y=20 and y-3 = - 4/7x

4. x=4y+4 and 4x+4y=4

If ava surveyed 350 people with 0.44 of respondents answering yes, then how many people anwered yes?

Find the circumference of a circle that has a diameter of 4 m. Use 3.14 for pi. 13 pts.

How can you solve problems involving equivalent expressions?

The difference of two complementary angles is 55 degrees. Find the measures of the angles.

What is 1056 divied by 7?

Ian has a list of 3 visit on a road trip with some friends. He needs to finalize the plans for the trip. How many different orders can he plan to visit the cities

From a group of 8 people, including George and Nina, 3 people are to be selected at random to work on a certain project. What is the probability that the 3 people selected will include George but not Nina? A) 5/56 B) 9/56 C) 15/56 D) 21/56 E) 25/56

5 (2x+6) - 17+0+0+0+0+0+0+0

What type of number is 3 - 771? Complex number Question in Khan Academy

2T+2T-8+3+5k there is a 2 as an exponent on the 5k but I can't wright it so FYI