Add. Do not use a number line except as a check.-2.8 + (-6) + (-5.7) + 19
A. -21.5
B. 16.5
C. 15.9
D. 4.5
Answer: D
Mathematics
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Solve the problem. Round your result to an appropriate number of significant digits.A lake lies between A and C, and lines AB and DE run north-south. If 
and 
how far is it from A to C?
A. 9.8 mi B. 7.3 mi C. 10 mi D. 6.2 mi
Mathematics
Using the factoring method, solve for the roots of the quadratic equation.20x2 + 5x = 0
A. x = 0, x = -4
B. x = 0, x = 4
C. x = 0, x = - 
D. x = 0, x = 
Mathematics
Solve.16x2 - 49 = 0
A. 
B. 
C. {7, 0}
D. 
Mathematics
Solve.The cost to sod a lawn is $0.27 per square foot. Find the cost to sod a triangular shaped lawn if the triangular region has a base of 
feet and an altitude of 
feet. Round the answer to the nearest cent.
A. $12.41 B. $6.2 C. $2.53 D. $5.07
Mathematics