If the lengths of three sides of a triangle are known, then the following formula, known as Hero's (or Heron's) formula is sometimes used:
?
??wherea,b, andcare the given lengths of the sides, and 
. Use this formula to find the area of a triangle with the lengths given below (correct to the nearest square foot).
? 
, 
, and 
?
__________ ft2
Fill in the blank(s) with the appropriate word(s).
Answer: 6
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Find the area of the shaded region.
A. 36 B. 27 C. 18 D. 45
Use the substitution method to solve the system. x + 6y = -6-2x + 7y = 12
A. (6, -1) B. (-6, 0) C. (-5, -6) D. No solution
Solve the system of equations by the substitution method.
A. (- 
, 
)
B. (
, - 
)
C. infinite number of solutions
D. no solution
Solve the problem.Two boats leave a dock at the same time. One boat is headed directly east at a constant speed of 35 knots (nautical miles per hour), and the other is headed directly south at a constant speed of 22 knots. Express the distance d between the boats as a function of the time t.
Fill in the blank(s) with the appropriate word(s).