Hey there! :)
Answer:
These two figures are similar because 5/3 equals 15/9.
Step-by-step explanation:
These figures are similar to each other, which means the side-lengths are proportional. Therefore:

Side-lengths 15 and 9 are proportional to 5 and 3 because the two fractions are equivalent; the larger rectangle is just 3 times larger.
X=((log(225000/200000)/log(1.03))
X=log(225,000÷200,000)÷log(1.03)
X=3.98 years
Answer:

Step-by-step explanation:
Given

Required
The x coordinate of the vertex
Using the general form:

The x coordinate is:

In 



So, we have:





Your answer should be (5, 1). But im not sure what your asking so I may be wrong.
Assume blank is x. So then we have 70 * x=210
or 70x=210. Divide both sides by 70
70x=210
x=30
The value of the blank is 3
P.S. I think I made this too complicated. Just divide both sides by 70 and you will get the answer