Solve the equation:
y = 4
Mathematics
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Solve by the substitution method.x + 7y = -222x + 6y = -12
A. {(-6, -3)} B. {(6, -4)} C. {(5, -3)} D. ?
Mathematics
Factor completely.y4 - 2y2z2 + z4
A. (y - z)2(y + z)2 B. (y - z)(y + z) C. (y - z)(y + z)(y2 + z2) D. (y2 - z2)2
Mathematics
Simplify.(2i)4
A. 2 B. 16i C. 16 D. 2i
Mathematics
In a strange mix-up, several people (none of whom spoke the same language) needed to pool their resources to survive the scorching desert heat. Eric had 47 bottles of water; Dimetrius had 
bottles; Sparticus had 
bottles. How many bottles of water did they have all together?
?
A. 145 bottles B. 120 bottles C. 135 bottles D. 47 bottles E. 148 bottles
Mathematics