An element with a mass of 680 grams decays by 27.7% per minute. To the nearest minute, how long will it be until there are 2 grams of the element remaining?

  3 minute    35.969420299997999 seconds

Step-by-step explanation:

Okay in simple words its 3 minute and 35 seconds or something.

Since we want to leave 2 grams ,

Amount to decay = 680-2

                             = 678g

Amount decayed per minute = 27.7 %

Amount decayed per minute ( in grams) = 188.36 g

Amount decayed per second ( in gram ) = 3.139333333g

Your required Ans =  678  /  3.139333333

                               = 215.9694203 seconds

                                i have converted them to minute in the title  : D

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer