<span>If you know that a single point is closed (as a set), then any finite set is closed because they are finite unions of closed (single point) sets.</span>
Answer:

Step-by-step explanation:
A recipe for sparkling grape juice calls for 1.5 quarts of sparkling water and 3/4 quart of grape juice.
The ratio of sparkling water to grape juice is

So, to make 100 quarts of punch you need x quarts of grape juice and 2x quarts of sparkling water.
Hence,

A) 2/5 is your answer
To solve this use cross multiplication.
See attachment to see how I soled it using this method.
Hope this helps!
The cream paint is 3/2 of the red, since there are three parts cream for every two parts red. Similarly, the blue paint is 1/2 of the red. Thus, there are 3/2*4=6 liters cream paint and 1/2*4=2 liters blue paint.
Approximately how many boxes that are 2 ft. by 2 ft. by 3.5 ft. fit inside of the back of a tractor trailer box truck whose dimensions are 28 ft. by 8 ft. by 9 ft.?
Solution:
Volume of trailer box= Number of boxes * Volume of Box
Volume of Trailer Box=Length*Width*Height
Dimensions of Trailer Box are 28 ft. by 8 ft. by 9 ft.
Volume of Trailer Box=28*8*9ft³=2016ft³
Dimensions of box are 2 ft. by 2 ft. by 3.5 ft.
Volume of Box=2*2*3.5ft³=14ft³
Volume of Trailer Box=Number of Boxes *Volume of Box
2016=Number of Boxes*14
To get, Number of Boxes, Let us divide by 14
2016/14=Number of Boxes=144
Number of Boxes=144
Answer: Option C:144 boxes