Solve the following word problems. Remember: define your variables, write a system of equations to represent the situation, and use elimination or substitution to solve. 1. The sum of twice a number and 4 times another number is 4. The first number decreased by the second number is 5. Find the numbers

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Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z