# Algebra

**Problem**

Solve for *x* from the following equations:

$xy = 12$ | $yz = 20$ | $zx = 15$ |

A. 2 | C. 4 |

B. 3 | D. 5 |

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**Problem**

A germ population has a growth curve $Ae^{0.4t}$. At what value of $t$ does its original value doubled?

A. t = 7.13 |
C. t = 1.73 |

B. t = 1.37 |
D. t = 3.71 |

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**Problem**

The sum and product of three distinct positive integers are 15 and 45, respectively. What is the smallest integer?

A. 1 | C. 5 |

B. 9 | D. 3 |

**Problem**

The first three terms of a geometric progression are 2*x*, 4*x* + 14 and 20*x* - 14. Find the sum of the first ten terms.

A. 413,633 | C. 489,335 |

B. 498,533 | D. 431,336 |

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**Problem**

If $\arcsin (3x - 4y) = 1.571$ and $\arccos (x - y) = 1.047$, what is the value of $x$?

A. 0.5 | C. 1.5 |

B. 1.0 | D. 2.0 |

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**Problem**

The digits of a three-digit number are in arithmetic progression. If you divide the number by the sum of its digits, the quotient is 26. If the digits are reversed, the resulting number is 198 more than the original number. Find the sum of all the digits.

A. 9 | C. 15 |

B. 12 | D. 18 |

**Problem**

There are 7 arithmetic means between 3 and 35. What is the sum of all the terms?

A. 133 | C. 665 |

B. 608 | D. 171 |

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**Problem**

A boat going upstream takes 1.5 times longer than going the same distance downstream. If the water current in the river is 8 kph, calculate the speed of the boat in still water.

A. 30 kph | C. 40 kph |

B. 50 kph | D. 20 kph |

**Problem**

When the polynomial $x^4 + bx^3 + 5x^2 + dx + 6$ is divided by $x - 2$ the remainder is 16. When it is divided by $x + 1$ the remainder is 10. Find the value of constant $d$.

A. 7 | C. -5 |

B. -7 | D. 5 |

**Problem**

Determine the percentage uncertainty in the area of a square that is 6.08 ± 0.01 m on a side.

A. 0.27% | C. 0.26% |

B. 0.25% | D. 0.29% |