Pilar and her sister Marisol live near the beach. Pilar has 80 seashells in her collection when Marisol started collecting seashells. Marisol started with zero seashells in her collection. ● Pilar adds 10 seashelles to her collection each week for x weeks.
● Marisol adds 20 seashells to her collection each week for x weeks. Please write and solve the equation that represents the situation when the number of seashells in Marisol's collection is the same as the number of seashells in Pilar's collection. Please make sure to show every step in solving this equation. THANK YOU FOR YOUR TIME.

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

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 and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?