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ira [324]
3 years ago
10

Please help me with math!!!

Mathematics
1 answer:
liubo4ka [24]3 years ago
5 0

Answer:

Step-by-step explanation:

To move all the constants to the right side: Subtract 0.4 from both sides

-9x = 3.6

To isolate the variable: Divide both sides of equation by -9

x = -3.6/9

Solution of the equation: -0.4

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Julia and Mackenzie have the same number of homework problems. Julia has done 1/3 of her homework. Mackenzie has done 1/2 of her
pentagon [3]
Julia because 1/3 is less than 1/2
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4 years ago
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A math class has 3 girls and 9 boys in the seventh grade and 7 girls and 3 boys in the eighth grade. The teacher randomly select
vladimir1956 [14]

Answer:

7/40

Step-by-step explanation:

There are 3 girls+9 boys = 12 students in the 7th grade

P (girl in 7th grade) = girls/ total

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There are 7 girls+3 boys = 10 students in the 8th grade

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8 0
3 years ago
Frank is 4 times as old as Lin. The difference in their ages is equal to Lin’s age plus 8. How old is each?
Minchanka [31]
Let Lin be x years old.
Lin = x
Frank = 4x

<span>The difference in their ages is equal to Lin’s age plus 8
</span>⇒4x - x= x + 8

Solve x:
4x - x= x + 8

Combine like terms:
3x = x + 8

Take away x from both sides:
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Divide by 2 on both sides:
x = 4

Lin is 4 years old.
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Answer: Lin is 4 years old and Frank is 16 years old.
7 0
3 years ago
Read 2 more answers
Please help, i will give brainliest
scoundrel [369]

3x+9=6x
-9 -9
—————
3x=6x-9
-6x -6x
—————
3x-6x=-9
-3x=-9
x=3

hope it helped
6 0
3 years ago
Suppose that in a large class, the instructor announces that the average grade on an exam is 75. Which is more likely to be clos
mario62 [17]

The mean of 10 randomly selected students is definitely more likely to be closer to 75. 10 randomly selected students to include information and are more like to reflect the class’s scores. Consider an extreme example. Seventy-five students in a class of 100 earned perfect scores. The other 25 earned zeros. The average score of the class would be 75. A sample of 10 random students would almost certainly include more 100s then 0s, but both would be included in the sample. The mean of this samples score is closer to 75 than any individuals.

8 0
3 years ago
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