Toothpicks can be arranged to form triangles as shown below. How many toothpicks are required to form a triangle with ten toothpicks on a side?
165
Mathematics
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Evaluate the polynomial.2x2 - y2 + 2xy for x = -3 and y = -5
A. 73 B. -73 C. -37 D. 23
Mathematics
Solve the problem.A construction crane lifts a bucket of sand originally weighing 
at a constant rate. Sand is lost from the bucket at a constant rate of
. How much work is done in lifting the sand 
? (Neglect the weight of the bucket.)
A. 11,200 ft ? lb B. 8000 ft ? lb C. 12,800 ft ? lb D. 9600 ft ? lb
Mathematics
Factor completely. If the polynomial is prime, say so.12wx - 6wy - 2xz + yz
A. (6wz)(2x - y) B. (6w - z)(2x - y) C. (6w + z)(2x + y) D. (6 - z)(2wx - y)
Mathematics
Write the expression in the standard form a + bi.(9 + 6i) - (-3 + i)
A. 12 - 5i B. -12 - 5i C. 12 + 5i D. 6 + 7i
Mathematics