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alina1380 [7]
3 years ago
9

Find the area of this isosceles trapezoid. A) 85.5 units2 B) 171 units2 C) 342 units? 345 units?​

Mathematics
1 answer:
liubo4ka [24]3 years ago
3 0

9514 1404 393

Answer:

  B) 171 units^2

Step-by-step explanation:

The area is given by the formula ...

  A = 1/2(b1 +b2)h

Filling in the given base and height values, we find the area to be ...

  A = 1/2(23 +15)(9) = (19)(9) = 171 . . . square units

_____

<em>Additional comment</em>

You can select the correct answer choice simply on the basis of "reasonableness." If this were a 9×15 rectangle, its area would be 9×15 = 135 square units, more than 85.5. You know its area is less than a 9×23 rectangle, so is less than 9×23 = 207 square units. Only one answer choice is a value between 135 and 207.

__

Multiplication by 9 is not so hard. It is multiplication by 10-1:

  15×9 = 15×(10 -1) = 150 -15 = 135

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vovangra [49]

Answer:

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Step-by-step explanation:

The recursive rule tells you the initial term of the sequence is a1 = -3, and the common difference is d=7. (7 is the value added to one term to get the next term.)

Putting these values into the formula for the explicit rule gives ...

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7 0
3 years ago
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ruslelena [56]

Answer:

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Step-by-step explanation:

Simplify the following:

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Factor 3 x out of 3 x^2 - 3 x y:

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-3 x (x - y) = 3 x y - 3 x^2:

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x y 15 + x y 3 = 18 x y:

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16 x^2 - 3 x^2 = 13 x^2:

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3 years ago
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Step-by-step explanation:

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