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sveta [45]
3 years ago
13

Find the product: (x+9)(x-9) a 18 b. -81 C. - 18 d. x-64

Mathematics
2 answers:
Lilit [14]3 years ago
5 0

Answer:

x^2 -81

Step-by-step explanation:

(x+9)(x-9)

FOIL

first x*x = x^2

outer -9x

inner 9x

last -9*9 = -81

Add them together

x^2 -9x+9x -81

Combine like terms

x^2 -81

olga nikolaevna [1]3 years ago
4 0

Answer: B

Step-by-step explanation:

Simply using (a-b)(a+b)=a^2-b^2.

Evaluate the power (9^2).

x^2 - 81

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Answer:

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3 years ago
Read 2 more answers
A textbook weighs 2.5 pounds. How many kilograms does the textbook weigh? Round your answer to the nearest tenth of a pound. 1 k
Alenkasestr [34]
The solution to the problem is as follows:

Given: 2.5 lb

Asked: 2.5 lb -----> kg

Answer:

2.5 lb * ( 1 kg/2.2 lb) = 1.1 kg

Therefore, the weight of the book in kg is 1.1 kg.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
4 0
3 years ago
I just need help with b and c
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Answer:

B. Carl yearns more per hour

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C isnt hard once you find y=15x.

8 0
3 years ago
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