Solve each by elimination 1. 6x - 4y = 0       -12 + 8y = 0 2. 12x + 10y = 16       -6x - 5y = -8 3. 6x - 8y = -14         3x + 12y = 18 4. 4x - 5y = 4         -9x + 12y = 18 5. 3x - 5y = 1         4x - 2y = -8 6. 20x - 25y = 10       12x - 15y = 9

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

Rewrite the polynomial -9x5 + 36x4 + 189x3 in factored form.

Huong is organizing paperback and hardback books for her club's used book sale. the number of paperbacks is 12 less than three times the number of hardbacks. huong had 162 paperbacks. how many hardback books were there?