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2 years ago

The equation of a circle is x2 +y2 =81 what is the diameter of the circle

Mathematics

1 answer:

Assoli18 [71]2 years ago

4 0

Answer:

pretty sure it's 9.

Step-by-step explanation:

square root of 81 is 9. 3 is its radius.

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If a+b=5 and a-b=4 then b^2-a^2 =

Anna007 [38]

Answer:

$a + b = 5 \\ a \: = 5 - b \\ a - b = 4 \\ 5 - b - b = 4 \\ 5 - 2b = 4 \\ 5 - 4 = 2b \\ 1 = 2b \\ \frac{1}{2} = \frac{2b}{2} \\0.5 = b \\ b = 0.5 \\ a = 5 - b \\ = 5 - 0.5 \\ = 4.5 \\ {a \: }^{2} - {b}^{2} = ( {4.5}^{2}) - ( {0.5}^{2} ) \\ = 20.25 - 0.25 \\ = 20 \\ {a}^{2} - {b}^{2} = 20$

Step-by-step explanation:

HOPE THAT THIS IS HELPFUL.

HAVE A GREAT DAY.

5 0

2 years ago

Which equation is equivalent to 63-3(2-10x)=150

kogti [31]

Answer:

D: 57 + 30x = 150

Step-by-step explanation:

63-3(2-10x)=150

63 - 6 + 30x = 150

57 + 30x = 150

4 0

2 years ago

Read 2 more answers

The BEST way to cool down from a workout is to

tresset_1 [31]

Put your hands on your head and breath while doing that walk around slowly until you feel cooled down

6 0

2 years ago

Mike drew a quadrilateral with four right angles. What shape could be drawn?

Darya [45]

There could be 2 possible shapes that could’ve been drawn.

A rectangle, or a square.

All of their angles are 90° angles, which are right angles.

Hope this helped!

5 0

2 years ago

Evaluate (4)^-4 pls answer!!!

geniusboy [140]

Answer:

Fraction: 1/256 or

Decimal: 0.00390625 or 0.00391

Step-by-step explanation:

4^-4=1/4^4

4^4=256

=1/256

8 0

2 years ago