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ahrayia [7]
3 years ago
7

The sum of a number and 20 is no more than the sum of the square of the number and 9.

Mathematics
2 answers:
choli [55]3 years ago
8 0
The answer is A because the phrase " no more than" stands for the symbol "less than or equal to", and "the sum of the square if the number and 9" stands for the number squared and then added to nine (x + 9)2.
Olegator [25]3 years ago
8 0

Answer:

Option A is correct

x+20 \leq x^2+9

Step-by-step explanation:

Let the number be x.

As per the statement:

The sum of a number and 20 is no more than the sum of the square of the number and 9.

"sum of a number and 20" translated to x + 20

"no more than" means \leq

"sum of the square of the number and 9" translated to x^2+9

then;

x+20 \leq x^2+9

Therefore, the following inequalities can be used to determine this unknown number is, x+20 \leq x^2+9

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If f(x) contains point (-3, 7), which point is definitely on f^-1(x)?
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A washer and a dryer cost $847 combined. The washer costs $53 less than the dryer. What is the cost of the dryer?
Natalija [7]
--------------------------------------------------------------
Define x :
--------------------------------------------------------------
Let the dryer be x.
Dryer = x 
Washer = x -53

--------------------------------------------------------------
Construct Equation :
--------------------------------------------------------------
The washer and the dryer cost $847
⇒ x + x - 53 = 847

--------------------------------------------------------------
Solve x :
--------------------------------------------------------------
x + x - 53 = 847
2x - 53 = 847
2x = 847 + 53
2x = 900
x = 450

--------------------------------------------------------------
Find cost of dryer and washer :
--------------------------------------------------------------
Dryer = x = $450
Washer = x = 450 - 53 = 397

--------------------------------------------------------------
Answer: Dryer = $450
--------------------------------------------------------------
3 0
3 years ago
Read 2 more answers
Chris made $184 for 8 hours of work. At the same rate, how much would he make for 13 hours of work?
pashok25 [27]

Answer:

$299

Step-by-step explanation:

Make a proportion

He makes $184 for 8 hours of work, and $x for 13 hours of work

184/8=x/13

To solve, we need to get x by itself. To do this, multiply both sides by 13. We multiply because x is being divide by 13, and we want to do the opposite.

13(184/8)=(x/13)13

The 13s on the right will cancel, leaving us with

13(23)=x

299=x

So, he will earn $299 for 13 hours of work.

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Step-by-step explanation:

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