6. Which situation cannot be represented by x + 4.5 = 8? Stephen plans to walk 8 miles this weekend. Schas walked
4.5 miles and plans to walk the rest later today Is x, the
distance Stephen needs to walk to reach his go
G
Maddy needs 4.5 more points to get on the leaderboard of her
video game. She currently has 8 points. What is x, the number of
points Maddy needs to get on the leaderboard?
Brianna spent $8 at the grocery store. She bought a case of Dr.
Pepper for $4.50 and a bag of chips. What is x, the cost of the bag
of chips?
A recipe calls for 8 cups of flour, Juan has already put in 4.5 cups.
What is x, the number of cups of flour Juan still needs to put in?
CLEAR ALL

Which statement best describes the expression 4y ÷ 9? (1 point) 9 divided by 4 times y 9 times y divided by 4 4 times y divided by 9 4 divided by 9 times y

The two expressions below have the same value when rounded to the nearest hundredth. log5 b log9 48 what is the approximate value of log b to the nearest hundredth? 0.93 1.23 9.16 65.53

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