An element with a mass of 680 grams decays by 24.2% per minute. to the nearest minute, how long will it be until there are 10 grams of the element remaining?
(im in 9th grade)

4 Minutes. (Approx, to the nearest minute)

Step-by-step explanation:

24.2% of 680 is: 164.56

164.56 * 4(Minutes) = 658.24

164.56 * 5(Minutes) = 822.8

So since it's rounded up, 5 minutes is too long because it would be long gone by then, and the next highest amount of minutes that it can decay for but not reach LESS than 10 grams left, is 4 minutes.

25

step-by-step explanation:

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.