Solve the quadratic equation by completing the square.x2 + 3x - 9 = 0
A. x = 
B. x = 
C. x = 
D. x = -3 ± 3
Answer: B
Mathematics
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Find the exact value of the product.cos
sin
A. 
B. - 
C. 
D. 
Mathematics
In April of 1986, the world's worst nuclear power disaster occurred at Chernobyl in the former USSR. An explosion released about 955 kilograms of radioactive cesium-137 (137 Cs) into the atmosphere. If the half-life of 137 Cs is 30.17 years, how much will remain in the atmosphere in 191 years? ? Please enter your answer as a number without the units, rounded to four decimal places.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Simplify.-
A. -
B. 2
C. 3
D. -3
Mathematics
Sketch the graph of the equation from 
to 
.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics