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MrRa [10]
3 years ago
9

There are 13 dimes and 7 pennies in a cup. What is the probability of not drawing a penny

Mathematics
2 answers:
andre [41]3 years ago
4 0
The probability of not drawing a penny is 13/20, or 0.65, or 65%
8_murik_8 [283]3 years ago
4 0
 13/20 chance of not drawing a penny
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Find the measure of the angle indicated (x). Round to the nearest tenth Show your work to support your answer
JulijaS [17]

Answer:

Karen,  this type of question is such a tricky question, there is a lot of things that you just have to remember for these.  Also, this type of question is asked a lot on brainly,  you are in good company :P   This also makes me wonder if math teachers are just REALLY BAD at teaching this.. hmmm   Something is up with this type of problem b/c I have answer 100s of these type on here.. they are tricky.  soooo...

Step-by-step explanation:

1st ,

Use SOH CAH TOA to recall how the trig functions fit on a triangle

SOH: Sin(Ф)= Opp / Hyp

CAH: Cos(Ф)= Adj / Hyp

TOA: Tan(Ф) = Opp / Adj

with the above info,  we can solve your triangle  :P  not meant to sound "wrong"  .. anyway

look for the info you are given and what you want to find... and match that to one of the 3 formulas.  after  you've done this a few 100 times.. you'll just remember the above formulas.  :D

sooo I see that we want to find that angle ∅ and we know two of the sides and that this is a right triangle.. which means we can use the above formulas on this triangle.  So we know the adjacent side and the opposite side, to the angle,  soo lets use TOA

Tan(∅) = Opp / Adj

Tan(∅) = 4 / 13

now the algebra gets a little tricky here.. but it's just using the inverse function of the Tan to find the angle .. it's just going  backwards with the function is all.. nothing to see here... move along.. :D

take the inverse Tan function ( arcTan)  on both sides... sooo

∅ = arcTan( 4 /13 )      ( this will find the angle, but make sure your calculator is set to degrees.. and not radians )

∅ = 17.1027...°

So, now we know that angle ∅

SOH CAH TOA is super helpful for this kind of triangle problem :)

7 0
2 years ago
The endurance of both track athletes and gymnasts is recorded in terms of maximum volume of oxygen and is measured in milliliter
Olin [163]
The mean of the track athletes is given by
\frac{89.2+45.3+89.1+57.3+61.5+80.1+47.2}{7}=67.1

The mean of the gymnasts is given by
\frac{72.1+78.5+66.2+47.3+63.1+89.3+65.3}{7}=68.8

The difference in mean is given by
68.8-67.1=1.73 (rounded to one decimal place)

4 0
3 years ago
Which relationship between x and y in the equation shows a proportional relationship?
8090 [49]

Answer:

y = 8x

Step-by-step explanation:

A proportional relationship has the form

y = kx ← k is the constant of proportion

The only equation in this form is

y = 8x

5 0
3 years ago
Read 2 more answers
Simplify 4 to the 2nd power ⋅ 4 to the 8th power.
Nonamiya [84]

Use exponent rule: x^y * x^z = x^y+z

4^2 * 4^8

4^2+8

4^10

1,048,576

Best of Luck!

5 0
3 years ago
Samuel filled the glasses shown below completely with water. The total amount of water that Samuel poured into the glasses is 60
Pepsi [2]

volume of glass 2 = pi*r^2*h/3= 3.14 *2.5^2*6/3 = 39.25 cubic cm

60-39.25 = 20.75 cu cm was in 1st cup

volume of cylinder = pi *r^2 *h

20.75 = 3.14 *2^2 *h

20.75 = 3.14*4*h

20.75 = 12.56*h

h = 20.75 /12.56 = 1.652 round to 1.7

4 0
3 years ago
Read 2 more answers
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