Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66

42nd term is 111

Step-by-step explanation:

Now, Using formula of nth term of an A.P. we have :

Now, first term a = -12 , n = 42 and d = 3

So, 42nd term is :

Hence, 42nd term is 111

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

its 4 because 2 times 2 is 4, if you double the number two you get four