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uranmaximum [27]
4 years ago
12

3x - 4y = 15 solve for y (use integers or fraction for any numbers in the expression)

Mathematics
1 answer:
Dimas [21]4 years ago
8 0
I looked it up I think this is it lmk if it’s wrong

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What is the inverse of the function h() = −9 + 11? Is it a function?
ycow [4]

Answer:

h=2 , maybe yes

Step-by-step explanation:

this is my answer i don't know if it is right

6 0
3 years ago
Micheal's mean score for five tests was 82. if four of those tests were 83,75,93, and 67, what was the fifth score on his test?
bezimeni [28]

Let T represent the fifth test score. The average is the sum of scores divided by their number.

... 82 = (83 +75 +93 +67 +T)/5

... 410 = 318 +T . . . . . . . multiply by 5

... 92 = T . . . . . . . . . . . . subtract 318

The fifth score was 92.

_____

One of the ways I like to work problems like these is to add the differences from the mean. Those are ...

1, -7, 11, -15

so their sum is -10.

The final score must be 10 above the mean in order for this total to be zero. 10 above the mean is 92.

5 0
3 years ago
you have 200 grams of a radioactive kind of iodine how much will ne left after 120 days if its half life is 60 days?
ElenaW [278]

By definition, the half life is a quantity is the time it takes to lose half of that quantity.

So, if the half life is 60 days, it means that after 60 days you have lost half the initial amount, i.e. you're left with 100 grams.

After another 60 days, you've lost, again, half of that amount, so you're left with 50 grams.

In other words, every time a half life period passes, you're left with half the quantity you had at the beginning of that period.

So, after two half-life periods (i.e. 120 days), you'll have half of the half of the initial quantity, i.e. one quarter.

4 0
3 years ago
Timmy's car can travel an average of 135 miles on 5 gallons of gas. How many gallons of gas will it use to travel 324 miles?
nika2105 [10]

Answer:

The answer is 12 cause 135 ➗5=27 then 324 ➗27 =12...

Step-by-step explanation:

Hope this helps! :)

4 0
3 years ago
Read 2 more answers
Show that (2, 1) is a solution of the system of equations.
Feliz [49]

Answer: The answer is 1. Substitute (2,1) into x+3y=5

Step-by-step explanation: Remember, (2,1) 2 is substituted for x and 1 is used as the y substitute

3 0
3 years ago
Read 2 more answers
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