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Goshia [24]
2 years ago
6

Which of the following answer choices correctly expresses the number 81? A. 3⁶ B. 3⁵ C. 3⁴ D. 3³​

Mathematics
1 answer:
kvasek [131]2 years ago
8 0

Answer: The answer is C

Step-by-step explanation:

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I need help with my algebra 2. I also want to know how to solve this.
Lisa [10]

Add 1 to both sides:

\sqrt{x+3} = x+1

In cases like this, we have to remember that a root is always positive, so we can square both sides only assuming that

x+1 \geq 0 \iff x \geq -1

Under this assumption, we square both sides and we have

x+3 = (x+1)^2 \iff x+3 = x^2+2x+1 \iff x^2+x-2 = 0

The solutions to this equation are

x = -2,\ x=1

But since we can only accept solutions greater than -1, we discard x=-2 and accept x=1.

In fact, we have

x=-2 \implies \sqrt{-2+3}-1=0\neq -2

and

x=1 \implies \sqrt{4}-1=1

which is the only solution.

4 0
3 years ago
Solve for a. a+(−4)=−13
dangina [55]
In your equation:  a+(-4)=-13
you then add four to each side, 
so a= negative 13 plus 4
so a=  -9
6 0
2 years ago
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Who knows about ratios
Kaylis [27]
I can help you. Just post the question
5 0
2 years ago
The length of the hypotenuse of a right triangle is 16 inches. If the length of one leg is 5 inches, what is the approximate len
atroni [7]
16^2-5^2=231
square 231=15.19
answer is 15.2
7 0
2 years ago
Read 2 more answers
30 points!!!!!
dlinn [17]
HELLO...!!

Diagonal = ?
Wide = 20 in.
High = 15 in.

Pythagoras formula: D² = H² + W²

D^2=(15)^2+(20)^2\\ \\D^2=225+400\\ \\D^2=625\\ \\D= \sqrt{625}\\ \\D=25\ in.\quad\Longrightarrow\boxed{\boxed{\mathbb{ANSWER\ \checkmark}}}\\ \\ \\\textbf{HOPE\ THIS\ HELPS...!!}
6 0
2 years ago
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