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rosijanka [135]
3 years ago
14

What is the product of (9+x)(9-x)

Mathematics
1 answer:
nata0808 [166]3 years ago
6 0

Answer:

81 - x^2

Step-by-step explanation:

this is a "special product," namely, the product of the sum and the difference of quantities 9 and x.

The product is the difference of two squares:

(9 + x)(9 - x) = 81 - x^2

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The value of a two-digit number is 10 more than 3 times the sum of its digits. The units digit is 1 more than twice the tens dig
mrs_skeptik [129]

Answer:

49

Step-by-step explanation:

the number is "ab" (2 digits).

ab - 10 = 3×(a+b)

a number is actually the sum of multiplying the digits with their associated powers of 10.

a×10 + b - 10 = 3a + 3b

7a - 2b = 10

b-1 = 2×a

b = 2a + 1

7a - 2×(2a+1) = 10

7a - 4a - 2 = 10

3a = 12

a = 4

b = 2×4 + 1 = 9

8 0
3 years ago
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mash [69]

Answer:

A

Step-by-step explanation:

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6 0
3 years ago
A six-sided number cube is rolled and a coin is tossed. What is the probability getting a 6 and a heads?
Whitepunk [10]
Cube= 1/6
coin= 1/2
1/2*3= 3/6
3/6+1/6= 4/6
4/6= 2/3
The answer is 4/6 or 2/3
6 0
3 years ago
Read 2 more answers
<img src="https://tex.z-dn.net/?f=%28%20%5Cfrac%7B1%7D%7B2%7D%29%5E%7B2%7D%20" id="TexFormula1" title="( \frac{1}{2})^{2} " alt=
Vladimir79 [104]
All you need to do is solve it
\frac{1}{2} ^{2} or \frac{1}{2}  x \frac{1}{2}
When solved your answer is 0.25 or 1/4
------------------------
What I did to solve it was....

1. Divide top fraction by bottom fraction to get decimal
1 ÷ 2 = 0.5

2. Then multiply 0.5 by its self (the same as putting it to the ^2)
0.5 x 0.5 = 0.25
5 0
3 years ago
Suppose 67% of all teenagers own a laptop and 29% of all teenagers own a laptop and a tablet. What is the probability that a tee
Darya [45]
The answer to your question is: B
5 0
3 years ago
Read 2 more answers
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