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patriot [66]
3 years ago
15

5(x -1) - 3x = -19solve for x​

Mathematics
1 answer:
jeka57 [31]3 years ago
7 0

Answer:

-7

Step-by-step explanation:

5x-5-3x=-19

2x-5=-19

2x=-14

x=-7

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martin's class has 28 students in it. 25% of those students are home sick today. how many students are home sick?
IRINA_888 [86]

Answer:

get a calculator and do 28 - 25%

Step-by-step explanation:

7 0
3 years ago
Find the value of a2 + b when a = -2 and b = 5
REY [17]

Answer: 9

Step-by-step explanation: In this problem, we're going to evaluate a² + b knowing that <em>a</em> = -2 and <em>b</em> = 5.

So the first thing we want to do is substitute these numbers into our problem.

Since <em>a</em> = -2, we will replace <em>a</em> with a -2 and as we do that, we will put that -2 in parentheses and square it since we have a². Squaring a number just means multiplying a number by itself so (-2)² is equal to 4 since a negative multiplied by a negative gives us a positive.

Now we will replace <em>b</em> with 5 and now we have the following.

4 + 5 simplifies to 9.

4 0
3 years ago
Out of 32 students in a class, 5 said the road their bikes to school.based on these results, how many of 800 students in the sch
irina1246 [14]

Answer:

125

Step-by-step explanation:

that would be , by proportion.  5 * 800 / 32

=  125 students

4 0
4 years ago
8. The ratio of the number of model
disa [49]

Answer:

48

Step-by-step explanation:

36 divided by 3 times 4.

7 0
3 years ago
If 6 times a certain number is added to8, the result is 32. Which of the following equations could be used to solve the problem
Alja [10]

This used to confuse me, too. We can use a variable to represent a number we don't know.

In elementary school, you had a problem that said 3 + _ = 8 and you could figure out the blank was 5.

Instead, we have 3 + x = 8 and we can figure out that x = 5.

We can also be given a value for x and asked something like if x = 8, what is x + 7, which we know is 15.

In algebra, when we multiply by a variable, we just say how many of that variable it is. Twelve times a variable is 12x or 12a or 12q, depending on what letter we decide to use to represent our variable.

So, six times a certain number, which we are spparently calling x, is 6x. Adding 8 to that is 6x + 8. Those do not combine to make 14 or 14x because one term has the variable and one does not.

If the result is 32...

6x + 8 = 32

Let's look at the other options.

6x = 32. Where's the 8 added??

6(x + 8) = 32. Well, that looks like it could be it, buuuuut we'd multiply 6 by everything in the parentheses, so this is 6 times the sum of a number and 8 is 32, or 6x + 48 = 32. Not quite.

6x = 8 + 32. That's six times a number equals the sum of 8 and 32, right? Thaaaat's not what it says.

7 0
4 years ago
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