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3 years ago

A pair of coins is tossed. What is the probability of no tails?

Mathematics

2 answers:

Alex3 years ago

7 0

Answer:

1(head)/2(possibilities) = 50%

50% or 1/2 I think

Delvig [45]3 years ago

7 0

Answer: 1/4

Step-by-step explanation:

If two coins are tossed, lets write out all the possibilities

H H

H T

T T

T H

P(getting no tails) = 1/4

In only one of the 4 possibilities were no tails shown.

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A builder wants to build the bridge whose cross section is shown in the diagram. Two companies offer simple bids on building the

leva [86]

The length of the bridge is the distance from the beginning to the end.

The distance b between each beam is 9ft.

Let:

$I \to$ I-Beam

$d_I \to$ distance between I beam and the bridge

$b \to$ distance between each I beam

Given that:

$I = \frac 34 ft\\$

$d_I = 3 ft$

$Length = 55ft\ 6in$ --- length of the bridge

From the diagram (see attachment), there are: 6 I-beams.

So, the length of the 6 I-beams is:

$L_1 = 6 \times I$

$L_1 = 6 \times \frac 34$

$L_1 = \frac {18}4$

$L_1 = 4.5ft$

There are 2 I-beams beside the bridge

So, the distance between the 2 I-beams and the bridge is:

$d_1 =2 \times d_I$

$d_1 =2 \times 3ft$

$d_1 =6ft$

There are 5 spaces between the I-beams

So, the length of the total spaces is:

$L_2 = 5 \times b$

$L_2 = 5b$

The total length is:

$Length = L_1 + d_1 + L_2$

So, we have:

$4.5ft + 6ft + 5b = 55ft\ 6in$

Collect like terms

$5b = 55ft\ 6in - 4.5ft - 6ft$

$5b = 44.5ft\ 6in$

Convert inches to feet

$5b = 44.5ft\ + \frac{6}{12}ft$

$5b = 44.5ft\ + 0.5ft$

$5b = 45ft$

Divide both sides by 5

$b = 9ft$

Hence, the distance (b) between each beam is 9ft.

Read more about lengths at:

brainly.com/question/22059747

3 0

3 years ago

Find the area of the circle a-21.98 m2 b-153.86 m2 c-14 m2 d-483.13 m2

Fantom [35]

Answer:

B) $153.86 meters^{2}$

Step-by-step explanation:

The formula for the area of a circle is : $\pi *radius^{2}$

The radius of a circle is the length from one side to the centre.

To work this out you would have to multiply pi by the radius of 7 squared, this gives you 153.94, however if using pi as in 3.14, then the answer is 153.86.

1) Multiply pi by 7 squared.

$\pi *7^{2} =153.86 meters^{2}$

6 0

4 years ago

Read 2 more answers

(25 POINTS) How do I structure this properly? I don't understand the way they are wanting me to do this, but I got the right ans

sergij07 [2.7K]

See the attached picture for solution and steps.

8 0

3 years ago

Read 2 more answers

A number that is 7 more than 3 times x

klio [65]

Not sure what the question is but 3x + 7 is the algebraic expression that would represent this statement.

6 0

3 years ago

Read 2 more answers

2x^2 / x^2 - y^2 - x^2 / xy - y ^ 2

Juliette [100K]

Answer:

2 - 2y^2 - x/y

Step-by-step explanation:

2x^2/x^2 = 2

and

x^2/xy = x/y

therefore

2x^2/x^2 - y^2 - x^2/xy - y^2

= 2 - y^2 - x/y - y^2

= 2 - y^2 - y^2 - x/y

= 2 - 2y^2 - x/y

6 0

3 years ago