Solve by the linear combination method (with or without multiplication).

6x + 7y = - 4

5x - 3y = - 21

a. (3, - 1)

b. (1, 7)

c. (-3, 2)

d. (-1, 3)

Jessie has a box of 1,000 marbles. He has 75 yellow marbles, 230 red marbles, 331 blue marbles, and 364 green marbles. What fraction of his marbles are yellow? What fraction of his marbles are red? Write each fraction as a decimal.

The population of the county modeled by the quadrilateral below is 1,500,000. Each unit on the grid represents 1 mile. To the nearest whole person, what is the population density of the county?

Diego pours 6.8 ounces of water from a full bottle. He estimates that he poured out 20% of the water in the bottle. About how much water was in the full bottle?

What is F (x) = 0.5x - 2

What is the measure of XYZ? O A. 68° O B. 22° O C. 136 O D. 34°

Are all diagonals also lines of symmetry? And can you explain why?

The neighborhood census shows that the 10 families in the neighborhood have 2, 4, 3, 2, 2, 1, 3, 4, 1, and 5 children. What would happen to the mean number of children in a family if a family with 4 children were added to the census?

How many water glasses are in a 17oz bottle?

The wheels of a car lock up and it skids 15 m. If it goes 3 times the speed it was going on the same road and under the same conditions, how far will it skid if it's wheels lock up again? A. 26 m b. 45 m c. 90 m d. none of the above

An observer in a lighthouse 350 ft above sea level observes two ships directly offshore. The angle to the shore are 4 and 6.5 degrees.