Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide mentally. They are useful in estimating the sum, difference, product, or quotient.
This is solved by breaking the equasion down.
2 { 5 [12 + 5 (500 - 100) + 399 ]}
2 { 5 [12 + 5 (400) + 399]}
2 { 5 [12 + 2000 + 399]}
2 { 5 [2411]}
2 {12055}
24110
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The formula for area of triangle is -

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So, the area of first triangle =



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Area of second triangle =



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Area of second triangle - Area of first triangle



Answer: 33
Step-by-step explanation: substitute a with 22 and c with 11.
22+11=33
Answer: The answer would be 72/97
Step-by-step explanation: Sin = opposite/hypotenuse. So 72 is opposite angle C and 97 is the hypotenuse (Longest Side).