Write the phrase as a mathematical expression. Use x to represent the number. Combine like terms if possible.2 times a number added to -6, added to 9 times the sum of 8 times the number 

A. 9(8x + 7) + [2x + (-6)]; 74x + 57
B. 2x - 6 + 9(8 + 7x); 65x + 74
C. 2(-6 + x) + 9(8x + 7); 74x - 5
D. 2(-6 + x) + 9(8 + 7x); 9x + 60


Answer: A

Mathematics

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Solve the problem by writing and solving a suitable system of equations.A flight leaves San Francisco at  and arrives in London at  (London time). This  difference includes the flight time plus the change in time zones. The return flight leaves London at  and arrives in San Francisco at 

src="https://sciemce.com/media/4/ppg__rrrrr0625191014__f1q15g5.jpg" alt="" style="vertical-align: -4.0px;" /> (San Francisco time). This difference includes the flight time minus the change in time zones, plus an extra hour due to the fact that the return flight westward is into the wind. Find the actual flight time eastward and the difference in time zones.

A. flight time eastward: 10 hours; difference in time zones: 8 hours
B. flight time eastward: 9 hours; difference in time zones: 9 hours
C. flight time eastward: 9 hours; difference in time zones: 8 hours
D. flight time eastward: 11 hours; difference in time zones: 7 hours

Mathematics

Solve the quadratic inequality by sketching the graph of the corresponding quadratic function.x2 - 9 ? 0

A. Solution: [-3, 3]

B. Solution: (-?, -3] ? [3, ?)

C. Solution: (-?, -3) ? (3, ?)

D. Solution: (-?, -3) ? (3, ?)

Mathematics

Use the table values and apply the Simpson's Rule to approximate  to one decimal place. x f(x) 3 1 3.8 0.3 4.6 0.2 5.4 0.8 6.2 0.3 7 0.2 7.8 0.4 ??

A. 1.7 B. 1.6 C. 1.3 D. 2.0 E. 2.3

Mathematics

Add or subtract. Simplify the answer. +  + 

A. 4
B. 2 
C.  
D.  

Mathematics