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Hunter-Best [27]
3 years ago
6

Please help with the questions in the image

Mathematics
1 answer:
allochka39001 [22]3 years ago
6 0

Answer:

fghjk

Step-by-step explanation:

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In a pile of 55 coins made of nickels and dimes totaling $3.90 how many of each coin are there
tigry1 [53]
There are 5 pennies in a nickel, and 10 pennies in a dime.  Now in $3.90 there are 390 pennies.

n = number of nickels in the pile

d = number of dimes in the pile

we know the pile has 55 coins, therefore whatever "n" and "d" are, we know that n + d = 55.

now, "n" is how many nickel coins are there, how many pennies is it in total?  well, 5 pennies to a nickel, for "n" nickels, will then be 5(n) or 5n.

and "d" is how many dime coins are there, so therefore in "d" coins, there are 10(d) pennies, or 10d.

we also know the total amount of pennies is 390, therefore 5n + 10d = 390.

\bf \begin{cases}
n+d=55\implies \boxed{n}=55-d\\
5n+10d=390\\
-------------\\
5\left(\boxed{55-d}  \right)+10d=390
\end{cases}
\\\\\\
275-5d+10d=390\implies 5d=115\implies d=\cfrac{115}{5}\implies d=23

how many nickel coins are there anyway?  well, n = 55 - d.
8 0
3 years ago
a bowl contains 30 eggs five of which are broken . if an egg is chosen at random , what is the probability that is not broken​
IgorLugansk [536]

Answer:

5/6

Step-by-step explanation:

There are 30 total eggs

There are 30 -5 =25 not broken

P( not broken) = not broken/total

                        = 25/30

                       = 5/6

3 0
2 years ago
What’s the least common multiple of 10,5 and 3
Alisiya [41]

Answer:

30

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Find (7 × 105) + (2 × 103).
Alisiya [41]
<span>7 × 105 = 735
</span><span>2 × 103 = 206
735 + 206 = 941

Your answer is 941.

Hope this helps!</span>
6 0
3 years ago
Read 2 more answers
How do I solve 2-2|7+2x|=0
Lelu [443]

Answer:

x=-3

x=-4

Step-by-step explanation:

-2|7+2x|=-2

|7+2x|=1

7+2x=1

x=-3

7+2x=-1

x=-4

4 0
3 years ago
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