The fountain contains 20 pennies and 9 dimes. A coin is randomly taken and not replaced. A second coin is randomly taken. What is the probability that both coins are pennies?

Answers

Answer 1

Answer: Well, the first coin has chance $(20)/(29)$ to be a penny. When it is a penny, the only valid case (the other case gives 0 for the multiplications later, so it is ignored) gives $(19)/(28)$ chance for the second one to be a penny. The result is $(20*19)/(29*28)$ , which is $(95)/(203)$ , or about 46.80% (rounded to the first 2 decimals)

Answer 2

Answer:

Answer:

9 dimes

Step-by-step explanation:

th fountai contains more that wat u would think but u mist move

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What is (7/12)/(5/9)? In simplest form..

Answers

$(7)/(12) / (5)/(9) =$

Change the division to multiplication through the reciprocal of the number being divided.

$(7)/(5) * (9)/(5) = (21)/(20)$

As mixed number:

$1 (1)/(20)$

7/12 times 5/9 equals 35/108. It is automatically in simplest form.

Jabari owns 100 shares of Stock A and 45 shares of Stock B. For the past month, his stocks have been fluctuating inversely each week. Stock A decreased by m cents per share and Stock B increased by n cents per share. Which equation can be used to find the total change in value of Jabari's shares?

Answers

This is how we solved and make the equation.
Stock A = 100
Stock B = 45

For the past months, his stocks inversely decreased.
Stock A = m cents / share
Stock B = n cents * share

So the equation is
= 100 (0.01m) + 45 (0.01n)
= m + 0.45n

An alarm rings 8 times every 5 secondswhat is the unit rate, in rings per second

a 0.625
b 1.6
c 3
d 40

Answers

Answer:

Step-by-step explanation:

8/5=1.6

Jamaal buys his clothes at Super Discounts. On Saturday, he bought shoes regularly priced at $40 for 25% off, and a jacket regularly priced at $100 for 30% off. Including a 6% sales tax, what total amount will Jamaal pay?

Answers

100-25=75%

$40-100%
$ x -75%

100x=3000
x=$30

100-30=70%

$100-100%
$ y - 70%

100y=7000
y=$70

total: x+y=70+30=$100

+ sales tax
100% +6%=106%

$100-100%
$ z - 106%

10600=100z
z=$106

Answer: Jammal will pay $106.

He would pay $30 for the shoes, and $70 for the jacket.

So, in total 106.

If log10(x^2y^3) =7 and log 10(x/y) =1 then x = blank and y= blank

Answers

From the second equation we get
$(x)/(y) =10$
Faim the first equation we get:
$x^2y^3=10^7$
We have $x=10y$ then
$(10y)^2y^3=10^7\ny^5=10^5\ny=10$
Then $x=10y=100$

The formula for density is given by p=m/v where p is density, M is mass and V is volume. If a substance has a mass of 27.82 grams and a volume of 3.6 ml, what is the most accurate density of the substance in g/ml7.7
7.7278
7.73
0.1