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White raven [17]
2 years ago
14

Two times a number is at least 16. Inequality

Mathematics
1 answer:
kati45 [8]2 years ago
6 0

Answer:

3x - 16 <= 8

Step-by-step explanation:

The key is to translate this problem, one step at a time:

Write an inequality

This tells us that we'll use >, <, ≥, or ≤ instead of = when describing the two sides of the equation.

that represents five less than

This tells us that we need to take away, or subtract 5: –5

two times a number

We don't know the number, so let's call it x. Two times x is 2x.

Then, the previous step tells us we want five less than twice the number, so we say 2x –5.

that is at least fifteen

"At least fifteen" tells us the first part of the equation can be greater than or equal to 15, which means we need the ≥ sign. If the phrase said "greater than fifteen," we'd use >.

Putting it all together, we get 2x – 5 ≥ 15.

then solve the inequality

We undo everything the algebra did to x to solve in the reverse order.

2x – 5 ≥ 15 First, undo the subtraction by adding 5 to both sides.

2x ≥ 20  Next, divide both sides by 2.

x ≥ 10.   We see that x has to be greater than or equal to 10. This means we could pick any number, 10 or greater, and plug it back into the equation we constructed to check our answer.

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Step-by-step explanation:


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Answer: 150% increase

Step-by-step explanation:

percent of increase: new/old × 100%-100%

--------------

new/this month: 20 puppies

old/last month: 8 puppies

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Hope this helps!! :)

Please let me know if you have any question

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A 13foot lader i upagenst a tree the bottom of the ladder is 5 feet away form the tree how high is the ladder on the tree
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Think of the 13-ft length of the ladder as the hypotenuse of a right triangle. Represent the horiz. distance from foot of ladder to base of tree by x, or 5 ft.

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Note: Please pay attention to your spelling: "lader i up agenst a tree" should be "the top of a 13-ft ladder is placed against a tree."

7 0
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