Solve the problem.A car travels 400 miles on level terrain in the same amount of time it travels 160 miles on mountainous terrain. If the rate of the car is 30 miles per hour less in the mountains than on level ground, find its rate in the mountains.
A. 40 mph
B. 50 mph
C. 80 mph
D. 20 mph
Answer: D
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Solve the problem.There are 8090 independent banking firms. If this represents 19% of the total number, what is the total number? Round to the nearest whole number.
A. 426 B. 1537 C. 42,579 D. 153,700
Decide whether or not the network is traversable.
A. Not traversable B. Traversable
Al-Khwârizmî solved the equation. 
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Here is a translation of his solution:
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. . . a square and 10 roots are equal to 39 units. The question therefore in this type of equation is about as follows: What is the square which combined with ten of its roots will give a sum total of 39? The manner of solving this type of equation is to take one-half of the roots just mentioned. Now the roots in the problem before us are 10. Therefore take 5, which multiplied by itself gives 25, an amount which you add to 39 giving 64. Having taken then the square root of this which is 8, subtract from it half the roots, 5, leaving 3. The number three therefore represents one root of this square, which itself, of course is 9. Nine therefore gives the square.
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Follow these directions to solve the equation.
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A. 1, 4
B. 1, -14
C. 2, -14
D. 2, 4
E. no solution
Simplify each side of the equation and then solve. Check your solution.7x + x = 8 - 32
A. 3 B. 8 C. -3 D. -8