3 years ago

Anyone know how to do this?¿?¿

Mathematics

2 answers:

vichka [17]3 years ago

7 0

0.65 x 40 = 26
So the answer is 26 pounds.

DanielleElmas [232]3 years ago

4 0

Change 65% to a decimal: 0.65
Since "of" in math means times, 0.65 x 40 = 26

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Why is -a² is always negative (a ≠ 0) and why is (-a)² is always positive?

hjlf

$-a^2=(-1)\cdot a\cdot a$

Regardless of the sign of $a$ , we have $a\cdot a=a^2\ge0$ (never negative). But multiplying by -1 makes it negative.

On the other hand,

$(-a)^2=((-1)\cdot a)^2=(-1)^2\cdot a^2=1\cdot a^2=a^2$

which can never be negative for real $a$ .

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3 years ago

I don’t understand how to get the answer

vesna_86 [32]

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3 years ago

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