21 is 84 percent of what number
1 answer:
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First way is create an equation like this:
and calculating it.
Second way is to find 37% of each number and then add it
+ 
In both cases the result is 10.829
and calculating it.
Second way is to find 37% of each number and then add it
In both cases the result is 10.829
Answer:
A = 57.97 cm²
Step-by-step explanation:
The area (A) of a trapezium is calculated as
A = h (a + b)
where h is the perpendicular height and a, b the parallel bases
Here h = 6.2, a = 10.8 and b = 7.9, thus
A = × 6.2 × (10.8 + 7.9) = 3.1 × 18.7 = 57.97 cm²