First task:
To determine this we need to make difference between system that doesn't have solution and system that has infinite number of solution. If when solving equations we get 0 = 0 that means system has infinite number of equations.
If we get 0 = some number that means that system doesn't have solution.
Multiplying first equation of second system by 2 and adding it to second equation we get 0=0 which means that this system has infinite number of solutions.
Answer is second system
Second task:
For this we need to set a system of equations and solve it. System looks like this:
x + y = 224
x*12 + y*8=2520
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x represents older than 18 and "y" 18 and younger than that.
first equation we multiply with -12 and sum it with second.
-4y = -168
y=168/4 = 42
Answer is 42.
Answer:
The simplest (and most commonly used) area calculations are for squares and rectangles. To find the area of a rectangle, multiply its height by its width. For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area.
This isn’t proper English please retype . All you will have to do is subtract because your answer obviously isn’t in the choices given to you
4300°F = 2371.111°C
conversion equation: (F − 32) × 5/9 = C
4300°F = 2644.261°K
conversion equation: (F − 32) × 5/9 + 273.15 = K
4300°C = 4573.15°K
conversion equation: C + 273.15 = K
4300°C = 7772°F
conversion equation: (C × 9/5) + 32 = F
4300°K = 4026.85°C
conversion equation: K − 273.15 = °C
4300°K = 7280.33°F
conversion equation: (K − 273.15) × 9/5 + 32 = F
To answer this question we should see how much work can be done per day by both workers. To figure this out we write out
3/5 of work done in 9 days
and divide both by 9 to get the amount of work per day which gives us (I will leave the answers in fraction form for the most precise answer)
1/15 of work done in 1 day
Now since this is the work done by two people we can assume that with only one person working the percentage of work done will reduce by half so we can say
1/30 of work by one man in 1 day
Now that we know that we must find out the total amount of work load which is known to be
3/5 + 1/30*4 = 11/15
so now we divide the workload by the amount of daily work produced to figure out how many days it will take paul to finish it so
11/15 divided by 1/30 = 22
The answer to this problem is 22 days
