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zavuch27 [327]
3 years ago
8

What is the value of f(x)= 9^x when x=-2? A) 1/8 B) 81 C) 1/18 D) 18

Mathematics
1 answer:
lions [1.4K]3 years ago
4 0
Substitute -2 in for x and get (9)^-2
Flip the equation so that the exponent is positive and get 1/9^2
Work it out 1/(9*9) = 1/81

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How do you simplify 1/5(40x^5+13x^3-3x-5)-(3x^5-5x^3+5x)
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Step-by-step explanation:

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19/20 in decimal equivalent
lorasvet [3.4K]
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40
Minchanka [31]

Answer:

A: 9 seconds

B: 144 ft.

Step-by-step explanation:

A:

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B:

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7 0
3 years ago
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If the perimeter of a square is 20, what is the length of the diagonal ?
Rina8888 [55]

Answer:

Step-by-step explanation:

if you know that the perimeter is 20,

then you have to divide by 4 to get the length of one side

20/4=5.

Draw the diagonal and write in it's length as x.

Use Pythagorean formula

Then know that a2+b2=c2

and use the two side lengths as a and b.

This gives you the equation

5^2+5^2=x^2.

Do the calculations and solve the equation.

25+25=x^2

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Therefore x=√50 where x equals the length of the diagonal.

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3 years ago
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