Use Heron's formula to solve the problem.An architect has measured the length of the sides of a triangular yard as 270 ft, 300 ft, and 
Find the area of the yard. Round to the nearest whole number. 
A. 1838 ft2
B. 3184 ft2
C. 39,635 ft2
D. 22,883 ft2
Answer: C
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the velocity vector.r(t) = (4t2 + 16)i + 
j
A. v = (8t)i + 
j
B. v = (8t)i - 
j
C. v = 
i + (8t)j
D. v = (8)i + 
j
Carli and Dale want to divide fairly the chocolate-strawberry cake shown below. The total cost of the cake was $18.00. Carli values strawberry and banana equally, but values chocolate twice as much as either of these put together. Dale values chocolate three times as much as he values strawberry. Further, he values strawberry twice as much as he values banana.
In Dale's eyes, the chocolate half of the cake is worth
A. $10.00 B. $12.50 C. $15.00 D. $12.00 E. none of these
Estimate the sum or difference by first rounding to the nearest ten.64
A. 160 B. 158 C. 200 D. 150
Divide and simplify.
A. - 
B. - 
C. - 
D. - 