A student uses a solution that contains 16 grams of water to conduct an evaporation experiment. At the end of one hour, the amount of water in the solution has decreased by 3.5%. At the end of two hours, the amount of water in the solution has decreased by another 4.25%. Which calculations can be used to determine the amount of water, in grams, remaining in the solution at the end of the second hour?

3.5% decrease means 96.5% remaining

0.965(16)

4.25% decrease means 95.75% remaining

0.9575(0.965(16))

= 14.7838 grams

Good evening

Step-by-step explanation:

Rule : _____________________________________________________

decrease something by p% then decrease by q% means multiply by

__________________________________________________________

Note : in our case the amount of water in the solution has decreased by 3.5% then by 4.25% consecutively____________________________________

Let’s apply what we have learnt:

the amount of water remaining in the solution at the end of the second hour is

Hope this helps.

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation: