X=-3
because
-4x=21-9
-4x= 12 divide both sides
x=-3
Step-by-step explanation:
The congruent angles of the isocels triangle's opposite sides's are congruent.
Answer:5(3+n)
Step-by-step explanation:
For some of these, a calculator is helpul.
The sum is 294903.
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This is the sum of 15 terms of a geometric sequence with first term 9 and common ratio 2. That sum is given by the formula

Point slope form- y-4=(x+2)
Slope intercept- y=x+6