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Sphinxa [80]
3 years ago
8

The formula for the area A of a trapezoid is A=1/2(b1+b2)h, where b1 and b2 represents the lengths of the bases and h represents

the height. Which equation can be used to find the height of a trapezoid?
A. h=2A-b1-b2
B. h=2A/b1+b2
C. h=A(b1+b2)/2
D. h=A-2/b1-b2

Mathematics
1 answer:
aleksandr82 [10.1K]3 years ago
6 0

Answer:

B. h=2A/(b1+b2) . . . . parentheses are needed

Step-by-step explanation:

Multiply the equation by the inverse of the coefficient of h. That coefficient is (b1 +b2)/2, so its inverse is 2/(b1 +b2). Parentheses are needed.

... 2A/(b1 +b2) = h

_____

<em>Comment on the answer choices</em>

As written, <em>none of them are correct</em>. The denominator can only be written without parentheses if the division bar is horizontal, and so serves also as a grouping symbol.

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lilavasa [31]

Answer:

A=1,2,3

B=x^2 is the answer

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What type of number is 0.25726?
pantera1 [17]

Answer:

B. Rational, not an integer

8 0
3 years ago
Bob's monthly bill is made up of a $10 fee plus $0.05 per minute. Write an expression that represents Bob's monthly phone if he
Salsk061 [2.6K]

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10 + 0.05m; m = 350 minutes

Bob's phone bill will be $27.50

Step-by-step explanation:

$10 + ($0.05 x 350 minutes) = $27.50

6 0
2 years ago
The number of tomato plants Jeff planted went from 4 last year to 12 this year. Find the percent increase.​
Dafna1 [17]
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Multiply by 100 to get the percentage, = 200%

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6 0
2 years ago
The cost, C. of producing coolers, x, is modeled by the equation C = 0.005x2 - 0.3x + 17. How many coolers are
melamori03 [73]

Answer:

66 coolers

Step-by-step explanation:

C = 0.005x² - 0.3x + 17

When C = $19

19 = 0.005x² - 0.3x + 17

19 - 17 = 0.005x² - 0.3x

2 = 0.005x² - 0.3x

0.005x² - 0.3x - 2 = 0

x = -b ± √b² - 4ac / 2a

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= 0.3 ± √ 0.09 - (-0.04) / 0.01

= 0.3 ± √ 0.09 + 0.04 / 0.01

= 0.3 ± √ 0.13 / 0.01

= 0.3/0.01 ± √0.13/0.01

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x = 30 ± 36

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x = 66 or -6

Number of coolers can not be negative

Therefore, number of coolers produced when the cost is $19

is 66 coolers

3 0
2 years ago
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