Solve the problem.A building 150 feet tall casts a 30 foot long shadow. If a person looks down from the top of the building, what is the measure of the angle between the end of the shadow and the vertical side of the building (to the nearest degree)? (Assume the person's eyes are level with the top of the building.)
A. 79°
B. 11°
C. 78°
D. 12°
Answer: B
Mathematics
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Subtract.(2x3 - 2x + 2) - (-x3 - 8x2 + 6)
A. 3x3 + 8x2 + 2x + -4 B. 2x3 + 8x2 - 2x + 8 C. 3x3 + 8x2 - 2x + -4 D. 3x3 - 8x2 - 2x + 8
Mathematics
The pH of a solution is given by the formula 
, where 
is the concentration of hydrogen ions in moles per liter in the solution. Use this formula to solve the problem.The pH value of a substance is 5.42. Find the hydrogen-ion concentration for this substance.
A. 263,026.8 B. 0.0000038 C. 1.7 D. 0.2
Mathematics
Identify the coefficient of each term.
x
A. x
B. 
C. 
D. - 
Mathematics
Find the exact value of the expression. Do not use a calculator.cos 50°sin 40° + sin 50°cos 40°
A. 0 B. 2 C. -1 D. 1
Mathematics