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3 years ago

Someone help me with problem 2 I do not understand. Help please and thank you

Mathematics

1 answer:

serious [3.7K]3 years ago

7 0

The height of trapezoid is: B) 5.2 cm

Step-by-step explanation:

Given formula of area of a trapezoid

$A = \frac{1}{2}(b_1+b_2)h$

Given

A = 57.2 cm^2

b1 = 10 cm

b2 = 12 cm

h = ?

Putting values in the formula

$57.2 = \frac{1}{2}(10+12)h\\57.2 = \frac{1}{2}(22)h\\57.2 = 11h$

dividing both sides by 11

$\frac{57.2}{11} = \frac{11h}{11}\\h = 5.2\ cm$

Hence,

The height of trapezoid is: B) 5.2 cm

Keywords: Area, height

Learn more about area at:

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2 years ago

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Vladimir79 [104]

Answer:

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Step-by-step explanation:

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3 years ago

What is the value of d21+d22+d23 given the matrix equation below?

sleet_krkn [62]

Answer:

B. 8

Step-by-step explanation:

The question lacks the required diagram. Find the diagram in the attachment.

Before we can find d21, d22 and d23, we need to get the matrix D first as shown in the attached solution.

On comparison as shown in the attachment, d21 = 11, d22 = -10 and d23 = 7

Note that d21 refers to element in the second row and first column of the matrix

d22 is the element in the second row and second column of the matrix

d23 is the element in the second row and third column of the matrix

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The second option is correct.

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3 years ago

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Art [367]

9514 1404 393

Answer:

Step-by-step explanation:

The sum of the measures of the two given arcs is 180°, the measure of semicircle ADC. Using this fact, we can find x and the measure of DC.

AD +DC = 180

(19x -49) +(5x +37) = 180

24x = 192 . . . . . . . . . . . add 12, simplify

x = 8 . . . . . . . . . . divide by 24

Then the measure of DC is ...

DC = 5x +37 = 5(8) +37 = 40 +37

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2 years ago

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Ymorist [56]

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2 years ago

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