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Sav [38]
3 years ago
8

A coin is tossed 3 times, find the probability that the coin will land heads up all 3 times, or tails up all 3 times.

Mathematics
1 answer:
SVEN [57.7K]3 years ago
4 0
1/3 of the time cause you are flipping it 3 times.
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There are nickles and quarters worth $2.20 in total. If there are 28 coins, how many nickels are there?
Eduardwww [97]
Answer:

There are 24 nickels

Step-by-step explanation:

Let x represent the number of nickels

Let y represent the number of quarters
—————————————————————

Value Value
Type Number of of
of of each all
Coin Coin Coin Coin
—————————————————————
Nickels | x | $0.05 | $0.05x
Quarters | y | $0.25 | $0.25y
—————————————————————
Totals 28 ——— $2.20
•••••••••••••••••••••••••••••••••••••••••••••••••

The first equation comes from the “Number of coins” column.

(Number of nickels) + (Number of quarters) = (total number of coins)

Equation: x + y = 28
—————————————————————
The second equation comes from the “value of all coins” column.

(Value of all nickels) + (Value of all quarters) = (Total value of all coins)

0.05x + 0.25y = 2.20

Remove the decimals by multiplying each term by 100:

5x + 25y = 220
—————————————————————
So we have the system of equations:

{x + y = 28
{5x + 25y = 202

Solve by substitution. Solve the first equation for y:

x + y = 28
y = 28 - x

Substitute (28 - x) for y in 5x + 25y = 220

5x + 25 (28 - x) = 220
5x + 700 - 25x = 220
-20x + 700 = 220
-20x = -480
x = 24

The number of nickels is 24.
————————————————————
Substitute in y = 28 - x
y = 28 - (24)
y = 4

The number of quarters is 4.
————————————————————
Checking:

24 nickels is $1.20 and 4 quarters is $1.00
That’s 28 coins.
Indeed $1.20 + $1.00 = $2.20
————————————————————

6 0
3 years ago
The equation of a line is y = -1. Will this produce a horizontal, vertical, or diagnol line?
Genrish500 [490]
It will graph a straight horizontal line at -1
4 0
2 years ago
Evaluate the imaginary number. Show all of your work for full credit. i^3
VikaD [51]

Answer:


Step-by-step explanation:

(i)(i)(i)=  -i



3 0
3 years ago
Read 2 more answers
MATH HELP!!!!!
Dimas [21]
<span>58% The sum of all the probabilities has to be 100%. In tennis, because there's no time limit, a match will always result in a win or a loss. Since Garry has won 42% of his games, that means that he's lost 100% - 42% = 58% of his games. And if you assume his win/loss ratio is reflective of his future games as well as his past games, then he as a 58% chances of loosing his next match.</span>
4 0
3 years ago
Use the drop-down menus to complete each statement to describe the relationship between the number of yards and the number of fe
juin [17]
<h2>Explanation:</h2>

The yard, whose symbol is yd, is standardized as 0.9144 meters since 1959.  The unit system that use it is both the imperial and the US units. On the other hand, the foot, whose symbol is ft, is standardized as 0.3048 meter. It is also used by the imperial and US units. The relationship between these two units is:

1yd=3ft \\ \\ 1ft=1/3yd

6 0
3 years ago
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