Answer:
Choice D
Step-by-step explanation:
Several techniques do exist for solving systems of linear equations; substitution method, graphical method and elimination method. For this scenario, since we are not restricted on the method, I opted to use the graphical technique.
The graphical solution to a system of linear equations is the point where the lines intersect. If the lines are never intersect then the system has no solution.
The attachment below shows that the system intersects at the point (-3, 26). Therefore, the system has a single solution: x = -3, y = 26.
28÷7=4 and 35÷7 is 5 so they can both be divided by seven so 7 students should be in each group
The answer is A
Med range = 65+15 /2 = 40
Range = 65-15=50
An algebra property whuch is used to multiply a single term and two or more terms inside a set of parentheses
The answer is C. c=47+21.