4 years ago

Which is a perfect square? 72 81 90 99

Mathematics

2 answers:

Pani-rosa [81]4 years ago

7 0

Answer:

81 is perfect square.

Step-by-step explanation:

Given numbers 72 81 90 99 .

We have to choose the number out of given options that are perfect squares.

PERFECT SQUARES are those numbers that be written as product of two equal numbers. Also perfect squares are those numbers that can be written as square of a number.

Thus, for given numbers

1) 72 = 8 × 9

2) 81= 9 × 9

3) 90= 9 × 10

4) 99 = 9 × 11

Thus, out of given option only 81 is written as product of two equal numbers.Thus 81 is perfect square.

Korvikt [17]4 years ago

3 0

Wouldn't it be 81?
Because 9x9=81
And that's how you get perfect squares

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What is the value of this expression when a = 4, b = -5, and c = -7?

Ganezh [65]

Answer:

The value of the given expression is -878.08.

Step-by-step explanation:

Here, the given question is INCOMPLETE.

The complete question is:

Evaluate the expression for a = 4, b = -5, and c = -7. $4a^2b^{-2}c^3$

Here, substitute the vale of a = 4, b = -5 and c = -7, we get:

$4a^2b^{-2}c^3 = (\frac{4a^2c^3}{b^2}) = (\frac{4(4)^2(-7)^3}{(-5)^2})\\= (\frac{64 \times 343}{25}) =\frac{21,952}{25} = 878.08\\\implies 4a^2b^{-2}c^3 = 878.08 ( a = 4, b = -5 ,c = -7)$