3 years ago

I need questions 1-5 please

Mathematics

2 answers:

NARA [144]3 years ago

7 0

I know number 1 which I think is -12 is an integer and rational number

KatRina [158]3 years ago

7 0

1.Integer 2.Rational Number 3.Rational Number 4.Whole Number 5.Rational Number

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50% increase followed by a 33 1/3% decrease

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a) Altitude of triangle ABC

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Nadusha1986 [10]

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Joshua finds the perimeter of the following composite figure composed of a square and right triangle so that a braid may be cut

Bumek [7]

The perimeter of a shape is the sum of its side lengths.

<em>Joshua miscalculated the third length of the triangle</em>

First, we calculate the third length (x) of the triangle.

Because the triangle is right-angled, we can make use of Pythagoras.

So we have:

$x^2 = 7^2 + 7^2$

$x^2 = 2(7^2)$

Take square roots of both sides

$x = \sqrt{2(7^2)$

$x = 7\sqrt{2$

The other shape in the figure is a square.

So, the perimeter (P) is

$P = 7 + x + x + x + 7$ ---- i.e. the sum of the visible lengths

So, we have:

$P = 7 + 7\sqrt2 + 7\sqrt2 + 7\sqrt2+ 7$

Evaluate like terms:

$P = 14 + 21\sqrt2$

Hence, Joshua's error is that:

<em>He miscalculated the third length of the triangle</em>