Jackson can remove the shingles off of a house in 7 hours, while martin can remove the shingles in 5 hours. how long will it take them to remove the shingles if they work together?

Step-by-step explanation:

WE can use the following formula:

Where "T" is the time time working together, "A" the time for person A working alon and "B" is the time for person B working alone.

Based on the data given in the exercise, we can identify that:

Therefore, substituting these values into the formula and solving for "T", we get that this is:

Since 1 hour has 60 minutes:

Therefore, if they work together, it will take them 2 hours and 55 minutes to remove the shingles.

Area = 132 Square units

Step-by-step explanation:

Looking at the diagram, the top horizontal chord distance that's missing is calculated as;

21 - (9 + 3) = 9 units

Total distance of top horizontal chord = 9 + 3 = 12 units

Now, formula for area of trapezium is;

Area = ½(a + b)h

Where h is height = 8 units

The parallel sides are a & B.

In this case; a = 12 units

b = 21 units

Thus;

Area = ½(12 + 21)8

Area = 4 × 33

Area = 132 Square units