3 years ago

Can somebody please check these? I'm struggling on this. If I'm wrong please correct me.

Mathematics

1 answer:

Minchanka [31]3 years ago

4 0

They all look good except for 4 5 and 6 switch them

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Find the

Mazyrski [523]

Answer:

54 cm

Step-by-step explanation:

The area (A) of an equilateral triangle is

A = $\frac{s^2\sqrt{3} }{4}$ ( s is the side length ) then

$\frac{s^2\sqrt{3} }{4}$ = 81 $\sqrt{3}$ ( multiply both sides by 4 to clear the fraction )

s² $\sqrt{3}$ = 324 $\sqrt{3}$ ( divide both sides by $\sqrt{3}$ )

s² = 324 ( take the square root of both sides )

s = $\sqrt{324}$ = 18

Thus

perimeter = 3 × 18 = 54 cm

3 0

3 years ago

PLZ HELP NEED ANSWER ASAP TIA

Arisa [49]

Answer:

A. 2(6a-3) = (6a-3)*2

4 0

3 years ago

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Which of the following could be a factor of the following Trinomial.<br> 3 points<br> x?+ 12x +27

mart [117]

Answer:

$(x + 9)$

Step-by-step explanation:

${x}^{2} + 12x + 27$

$(x {}^{2} + 3x) + (9x + 27)$

$x(x + 3) + 9(x + 3)$

$(x + 3)(x + 9)$

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4 0

3 years ago

Help needed right away this is timed

ss7ja [257]

I think it might be x

3 0

3 years ago

A square has a side length of 20 cm. What are the dimensigns of a rectangle that has the same area as the square?

Minchanka [31]

40cm and 10cm are the dimensions

7 0

4 years ago

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