*Esprimi *con termini o formule le seguenti descrizioni:

A: | x increased by twice y |

B: | the quotient of x and the sum of y and 100 |

C: | half of x increased by the product of 25 and y |

D: | two-thirds the sum of x and three-sevenths of y |

E: | the quotient of x and 10 minus four times their sum |

F: | 60 diminished by one-third the product of 7 and x |

G: | x equals y-square |

H: | the difference between ten times x and one-half of x is exactly the same as nine and one-half times x |

K: | if the square root of 9 is subtracted from the cube root of 27 the risult is 0 |

Y: | the reciprocal of the ratio of x to y is the ratio of y to x |