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Over [174]
3 years ago
14

Solve (x - 2 < 5) ∩ (x + 7 > 6).

Mathematics
2 answers:
WITCHER [35]3 years ago
5 0

For this case we must solve the following expression:

x-2 intersected x + 7> 6

We have:

x-2

Adding 2 to both sides of the inequality:

x

The solution is given by all values of x less strict than 7.

Now we have:

x + 7> 6

Subtracting 7 from both sides of the inequality:

x> 6-7\\x> -1

The solution is given by all values of x higher than -1.

If we intersect the solutions we have:

The solution is given by all values of x between -1 and 7. That is:

(-1,7)

Answer:

-1

Scrat [10]3 years ago
3 0

Answer:

-1<x<7

Step-by-step explanation:

We need to solve each inequality and then from the interval of numbers they both have in common (doing this because of the 'and').

x-2<5

Add 2 on both sides:

x<5+2

Simplify:

x<7

These are values of x that are less than 7.

x+7>6

Subtract 7 on both sides:

x>6-7

Simplify:

x>-1

These are values of x greater than -1.

So the values they have in common are the numbers in between -1 and 7.

That is x<7 and x>-1.

You can also write it as -1<x<7.

Maybe you need a graph to convince you more.

○~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~~~~○

‐-------------(-1)------------------------(7)-----------------

So where you see both graphs is the solution:

○~~~~~~~~~~~~~~○

‐-------------(-1)------------------------(7)-----------------

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3 years ago
Two identical jars are filled with equal numbers of marbles. The marbles are colored red or white. The ratio of red to white mar
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Let a=the number of white marbles in Jar 1
Let b=the number of white marbles in Jar 2
Total number of white marbles is a+b=90

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Jar 2 has b white marbles and 9b red marbles so 10b marbles total
Since both jars have equal amounts of marbles, 8a=10b

We have a system of equations:
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8a=10b
⇒a=\frac{5}{4}b
⇒\frac{5}{4}b+b=90
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3 years ago
How many cups did eddy order
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at a spa, the customer is offered a choice of fice different massages and eight different pedicures. How many different combunat
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