2 answers:
Answer:
1+2x-63x^2
Step-by-step explanation:
factor 1(1+9x)=1+9X
-7x(1+9x)=-7x-63x^2
add 1+9x-7x-63x2
ANSWER

EXPLANATION
The given product is (1-7x)(1+9x).
Expand using the distributive property.


Simplify to obtain:

You can rewrite in standard form to get,

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Answer:
Step-by-step explanation:
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Answer:
35 miles per hour
Step-by-step explanation:
Ann travels a total of (100 +40) = 140 miles in (3 +1) = 4 hours. Her average speed is the ratio of these:
speed = distance/time
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It would be 7x7 + 2x2 = 53
Solving for x you would get X=6