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kirza4 [7]
4 years ago
14

If a= -5, what is the value of a^2-4/a+2

Mathematics
1 answer:
Luda [366]4 years ago
5 0

Answer:

-7

Step-by-step explanation: When a= 5, let's substitute all a's with 5 in the expression:

\frac{a^{2}-4 }{a+2}\\\frac{(-5)^{2}-4 }{-5+2}\\\\\frac{25-4}{-3}\\\frac{21}{-3} \\= -7

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Two bells ring every 10 and 25 minutes respectively. They start ringing together at 6 a.m. At what time will they next ring toge
qwelly [4]

Answer:

6:50

Step-by-step explanation:

The bell that rings every 10 min will ring at 6:00, 6:10, 6:20,6:30, 6:40, 6:50

The bell that rings every 25 min will ring at 6:00, 6:25, and 6:50

7 0
3 years ago
How do I solve this do we use the multiple choice
belka [17]

Answer:

  (C)  4|5 -2x| > 68

Step-by-step explanation:

You can solve each of the inequalities to see if their solutions match the given numbers, or you can start with the given numbers and see what sort of inequality you end up with.

If you plot the given "solution" on a number line, you find that the numbers -6 and 11 are the same distance from x=2.5. That distance is 8.5 units. (One way to deterimine this is to average -6 and 11, then subtract that average from 11 to find the distance.

So, we can write an inequality describing values of x that are more than 8.5 units from 2.5:

  |x -2.5| > 8.5

and it will have the solution x < -6 or x > 11.

Multiplying this by 2, it can become ...

   |2x -5| > 17

Of course, since the absolute value function doesn't care whether its argument is positive or negative, we can also write this as ...

   |5 -2x| > 17

This tells you right away which answer choice is appropriate. Further confirmation can be had by multiplying this by 4:

  4|5 -2x| > 68 . . . . . . matches selection C

5 0
3 years ago
What is 5/4 divided by 1/3
koban [17]
The answer is !5/ 4 because when dividing a fraction by a fraction you multiply the first fraction by the second fractions reciprocal. 
4 0
3 years ago
Read 2 more answers
Geometry Find x and y given that the quadrilateral is a parallelogram
kherson [118]

Answer:

x = 3

y = 2

Step-by-step explanation:

Opposite side of parallelogram are equal.

-4x + 6 = -6x

-4x = -12x

-x = -3

x = 3

7y + 3 = 12y - 7

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-y = -2

y = 2

6 0
3 years ago
What is 7 + 6x for x = -3?
Temka [501]

Answer:

-11

Step-by-step explanation:

8 0
3 years ago
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