5. Samantha has 30 coins, consisting of 20c and 50c, which total $13.50. How many of each does she have?​

50c = 25

20c = 5

Step-by-step explanation:

50x + 20y = 1350 (1) - multiply y by one.

x + y = 30 (2) - multiply y by  20.

50x + 20y = 1350 (1)

20x + 20y = 600 (2)

If you treat it like simultaneous equations, you take away equation 2 from equation 1.

30x = 750

x = 25

Then, once you have your value of x, you can substitute it back into the original equations to find your answer.

x + y = 30

25 + y = 30

y = 5

Then you have your answer. Hope this helps :)

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72