Which expression is equivalent to -9 - \left(-4\dfrac13\right)−9−(−4 3 1 )minus, 9, minus, left parenthesis, minus, 4, start fraction, 1, divided by, 3, end fraction, right parenthesis? choose 1 choose 1 (choice a) a -)−4 3 1 −(−9)minus, 4, start fraction, 1, divided by, 3, end fraction, minus, left parenthesis, minus, 9, right parenthesis (choice b) b -4\dfrac13+(-9)−4 3 1 +(−9)minus, 4, start fraction, 1, divided by, 3, end fraction, plus, left parenthesis, minus, 9, right parenthesis (choice c) c -9 +4\dfrac13−9+4 3 1 minus, 9, plus, 4, start fraction, 1, divided by, 3, end fraction (choice d) d 9-\left(-4\dfrac13\right)9−(−4 3 1 )9, minus, left parenthesis, minus, 4, start fraction, 1, divided by, 3, end fraction, right parenthesis stuck? watch a video or use a hint. report a problem 4 of 4

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60

Solutions for 2x+7 less than or equal to 3x-5

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared