If it is written as log base 2 (1/64) then you make it equal a question mark (believe me)
then you rewrite to exponential form so you would write it as 2^? = 1/64
and 1-64 is the same as 2^-6, so negative 6 is your answer
10(1 + 4a) - 7a = -6a + 5(1 + 8a)
10 + 40a - 7a = -6a + 5 + 40a
-40. -40
10 - 7a = -6a + 5
-7a + 6a = 5 - 10
-a = -5
5 = a
Total amount saved in 1st case :
Total amount saved in 2nd case :
( Here are number of months )
Let, after x months the amount saved in both cases is same.
So,
Amount saved :
Hence, this is the required solution.
Answer:
C. 19
Step-by-step explanation:
90+26=116
180-116=64
3x+7=64
3x=57
x=19