Since 25% is 1/4 divide 28 by 4 to get your answer of 9.5
19.70-13=6.7
6.7/0.05=134
600+134=734
So in April she sent 734 text messages
You would need to know the dimensions of the pyramid and wether it was triangle or square bottomed
lox (x) = -5
rewrite the equation in exponential form:
10^-5 = x
10^-5 = 1/10000
1/10000 = 0.00001
That is the correct answer.