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nexus9112 [7]
3 years ago
6

How many 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is not allowed?

Mathematics
1 answer:
attashe74 [19]3 years ago
7 0
Think of it this way:
_ _ _ (3 digit number)

for the first blank you could have 7 possibilities
for the second blank you could have 6 possibilities
for the third blank you could have 5 possibilities
because each time you fill in a blank one number is removed from the list of possibilities

7×6×5=210. there are 210 possibilities
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You have 16 coins that are heads up and 18 coins that are tails up. After you add some coins that are tails up, the ratio of hea
Gwar [14]
So 16=heads
18=tails
after you add some tails
18+x

ratio of heads to tails is 1:1.5
heads=16, didn't change
tails=18+x

so
1:1.5=16:18+x
fractionify
1/1.5=16/(18+x)
1/1.5=2/3
2/3=16/(18+x)
mutiply both sides by (3)(18+x)
2(18+x)=3(16)
36+2x=48
subtract 36 from both sides
2x=12
divide 2
x=6

6 tails added


total=heads+tails
heads=16
tails=18+6=24
total=16+24
total=40



6 tails added
40 total coins
6 0
3 years ago
Can you explain to me (detailed) on how to do this problem? I will give you a brainly if you get this right.
7nadin3 [17]

Answer:

60 m^2

Step-by-step explanation:

To solve the area, solve the triangle and rectangle separately.

Solve the rectangle:

Multiply 10 and 4 to get the area of 40 m^2.

Solve the triangle:

Multiply 10 and 4, then divide by 2. The formula for a triangle's area is base*height/2. The area is 20.

Add together:

40+20 = 60 m^2

6 0
3 years ago
Find the values of x and y<br> X =<br> Y=
labwork [276]

Answer:

Find the values of x and y

X =60

Y=60

60°

3 0
2 years ago
This may seem silly but how do you multiply 8 times 8 it all ways stumps me.
qaws [65]
Lets solve this step by step. 

8 * 8 = 64 

Lets suppose there are 8 aquariums and there are 8 fish in each. Therefore, there are 8 groups of 8 fish. Add and solve. 

8+8+8+8+8+8+8+8 = 64 

4 0
3 years ago
Read 2 more answers
Math question down below
Andrei [34K]
Eq. of given line is x = -2 》x + 2 = 0
6 0
3 years ago
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