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4 years ago

{1,2,3,...,75,76,78} how many numbers in the set above have 2 as a factor but not have 10 as a factor

Mathematics

1 answer:

Alinara [238K]4 years ago

5 0

Answer:

Step-by-step explanation:

From 1 to 10 we have 4 numbers which are {2,4,6,8}

From 10 to 20 we have 4 numbers which are {12,14,16,18}

From 70 to 78 we have 4 numbers which are {72,747,6,78}

conclusion: we 4×8 number = 32

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PLEASE HELP Complete the table with the number of sit-ups you have to do sunday so that the mean number of sit-ups per day is 10

klemol [59]

The complete table will be:

$Monday - 100\\ Tuesday-65\\ Wednesday- 120\\ Thursday-150\\ Friday-90\\ Saturday- 0\\ Sunday-175$

Explanation

Suppose, the number of sit-ups in Sunday is $x$

Mean is the simple average of some numbers. For finding the mean number of sit-ups per day, we need to divide the 'total number of sit-ups' by the 'total number of days'.

Here the total number of days is 7 and the total number of sit-ups for 7 days $= 100+65+120+150+90+0+x= 525+x$

Given that, the mean number of sit-ups per day is 100. So, the equation will be...

$\frac{525+x}{7}=100\\ \\ 525+x=700\\ \\ x= 700-525=175$

So, the number of sit-ups you have to do Sunday is 175.

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pav-90 [236]

Answer:

Answer choice B.

Step-by-step explanation:

Remember the 3:4:5 rule.

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3 years ago

Use the substitution method to solve the system of equations

Sergeeva-Olga [200]

Answer:

x=1/4

y = -2

(1/4, -2)

Step-by-step explanation:

4x -y =3

y =-8x

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4x -y =3

4x - (-8x) =3

4x+8x=3

combine like terms

12x = 3

divide by 12

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now we need to find y

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