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3 years ago

10

The formula for a trapezoid relates the area A, the two bases, a and b, and the height, h. A=h ( a+b ) 2 Solve for b.

2 answers:

Alborosie3 years ago

6 0

B= 2a/ h - a

Hope it helps!

Lelu [443]3 years ago

5 0

I believe the right equation for determining the area of a trapezoid is as below,
A = h(a + b)/2

To determine the expression for b which is the length of one of its bases, we multiply the equation by 2.

2A = h(a + b)

Then, divide both sides of the equation by h,

2A/h = a + b

Then, subtract a from both sides of the equation,
2A/h - a = b

Lastly, interchange the sides of the equation to reveal the answer.
<em> </em>
<em> b = 2A/h - a </em>

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Read 2 more answers

Seventy percent of children who go to the doctor have fevers. Of those with fevers, 30% also have a rash. Of those without fever

Allisa [31]

Answer:

The probability that a child with a rash does not have a fever is 22%

Step-by-step explanation:

1. Probability of having fever:

$P(fever)=0.70$

2. Probability of not having fever:

$P(not fever)=1-P(fever)\\P(not fever)=1-0.70\\P(not fever)=0.30$

3. Probability of fave fevers and a rash:

$P(fever and rash)=(0.70)(0.30)=0.21$

4. Probability of having a rash but not a fever:

$P(rash and not fever)=(0.30)(0.20)=0.60$

5. Probability of having a rash:

$P(rash)=P(rash and fever)+P(rash and no fever)\\P(rash)=0.21+0.06=0.27$

6. Probability a child with a rash does not have a fever

$P=\frac{P(rash and not fever)}{P(rash)} =\frac{0.06}{0.27} =0.22$

22% of the child at the doctor's office with a rash does not have a fever.

5 0

3 years ago