77 is the answer because 3×7=21 21+56=77
Answer:
25.7
Step-by-step explanation:
The simpliest way to do this is to turn both fractions into decimals
7/10 goes to 0.7 and 2/5 goes to 0.4
then the equation would be 0.7x + 20 = 0.4
hope I've helped!
Given:
![\log (5k+4)=8r](https://tex.z-dn.net/?f=%5Clog%20%285k%2B4%29%3D8r)
To find:
The exponential form of given equation.
Solution:
We have,
![\log (5k+4)=8r](https://tex.z-dn.net/?f=%5Clog%20%285k%2B4%29%3D8r)
According to the property of the logarithm,
![\log_ax=y\Rightarrow x=a^y](https://tex.z-dn.net/?f=%5Clog_ax%3Dy%5CRightarrow%20x%3Da%5Ey)
Using the above property of the logarithm, we get
Therefore, the required equation in exponential form is
.