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3 years ago

PLEASE HELP ME GEOMETRY

Mathematics

1 answer:

Aloiza [94]3 years ago

4 0

Answer is B. second choice

Segments DE and AC are parallel by construction

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The dimensions of a closed rectangular box are measured as 97 cm, 67 cm, and 34 cm, respectively, with a possible error of 0.2 c

Dahasolnce [82]

Answer:

The maximum error in calculating the surface area of the box is $158.4 \:cm^2$ .

Step-by-step explanation:

Differentials are infinitely small quantities. Given a function $y=f(x)$ we call $dy$ and $dx$ differentials and the relationship between them is given by,

$dy=f'(x) \:dx$

If the dimensions of the box are $l$ , $w$ and $h$ , its surface area is $A=2(wl+hl+hw)$ and

$dA=\frac{\partial A}{\partial l}dl+\frac{\partial A}{\partial w}dw+\frac{\partial A}{\partial h}dh\\\\dA=2(w+h)dl+2(h+l)dw+2(w+l)dh$

To find the largest error in the surface area, we therefore use $dl=0.2, dw=0.2, dh=0.2$ together with $l=97, w=67,h=34$

$dA=2(w+h)dl+2(h+l)dw+2(w+l)dh\\\\dA=2(67+34)\cdot 0.2+2(34+97)\cdot 0.2+2(67+97)\cdot 0.2\\\\dA=158.4 \:cm^2$

An error of 0.2 cm in each dimension could lead to an error of $158.4 \:cm^2$ in the calculated surface area.

3 0

3 years ago

NEED HELP ASAP!

Inga [223]

Answer:

The answer to your question is:

61.- 25

62.- 26

Step-by-step explanation:

61.-

2(5x + 5) + 2(2x) = 360

10x + 10 + 4x = 360

14x = 360 - 10

14x = 350

x = 350/14

x = 25

62.-

2(4x - 4) + 2(3x + 2) = 360

8x - 8 + 6x + 4 = 360

14x - 4 = 360

14x = 360 + 4

14x = 364

x = 364 / 14

x = 26

3 0

3 years ago

In triangle ABC m A.47 B.109 C.114 D.71

sashaice [31]

Answer:

Step-by-step explanation:

in a triangle all the angles together equal 180°. So all you have to do is add 43 + 66=109 and then subtract that from 180

4 0

3 years ago

Draw two identical rectangle. Shade 1 seventh of one rectangle and 1 tenth of the other. Lavel the unit fractions. Use you recta

Bumek [7]

Answer:

1/7 is greater than 1/10 using coordinates and its area of the division concept.

Step-by-step explanation:

We have to draw two identical rectangles and have to shade them.

Here is the diagram attached with. (With some approximation)

We can see that $\frac{1}{7} > \frac{1}{10}$ .

Rectangles are identical.

When we look upon $\frac{1}{10}$ it can be observed that each division on the coordinate plane have 2 boxes only...

Where as $\frac{1}{7}$ fraction consists more than 2 boxes ..

So we can say that the area covered for each division in $\frac{1}{7}$ is more than that of $\frac{1}{10}$ .

Mathematical concept:

If the numerator are same then to compare fractions we look upon denominators values.

Greater the denominator lesser is the fraction values.

So,

Finally we can say that 1/7 is greater than 1/10 .

5 0

3 years ago

AB and EDC are parallel lines.

ohaa [14]

Answer:

x = 125°, y = 55°, z = 70°

Step-by-step explanation:

x and 55 are adjacent angles and are supplementary, sum to 180°, that is

x + 55° = 180° ( subtract 55° from both sides )

x = 125°

∠ ABD and ∠ BDC are alternate angles and congruent , so

y = 55°

Since BD and BC are congruent, then Δ BCD is isosceles, so

∠ BDC = ∠ BCD = 55° and

z = 180° - (55 + 55)° ← angle sum of triangle

= 180° - 110°

= 70°

3 0

3 years ago