Janice is trying to earn $30 to buy a necklace. she has saved $5.25. she earns $2.25 per hour weeding her grandmother's garden and she earns $5.50 per hour selling seashells at the flea market. will janice have enough to buy the necklace if she works in the garden for 2 hours and at the flea market for 4 hours? use the inequality 2.25y + 5.50z + 5.25 ? 30. yes, because the total will be $26.50. yes, because the total will be $31.75. no, because the total will be $25.25. no, because the total will be $46.50.

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

Acylinder has volume 45π and radius 3. what is it’s height?

Evaluate this using ! 0.25^2 x 2.4 + 0.25 x 2.4^2 − 0.25 x 2.4 x 0.65