Answer:
25
Step-by-step explanation:
ABC is a right angle so ABD and DBC are <em>complementary angles</em> and their sum is equal to 90:
x + 55 = 90 subtract 55 from both sides
x = 25
<h3>
Answer:</h3>
A.
+-5x+14x+-35
+9x-35
B. 

C. 

D. 


Step-by-step explanation:
A. (3x*2x)+(3x*-5)+(7*2x)+(7*-5)
Multiply and simplify.
+9x-35
B. (
)+(
-3x)+(2x
)+(2x
)
Multiply and simplify.

C. 
Multiply and simplify.

D. 
Multiply and simplify.

I hope this helps!
But you should really do this yourself.
one of those questions are polynomials and the one that is a polynomial is obviously the answer and that would be the third one
Answer:
$60
Step-by-step explanation:
set up a proportion and cross-multiply:
3000/400 = cost/450
c = cost
3,000c = 180,000
c = 180/3
c = 60
Answer:
B.
Step-by-step explanation: