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3 years ago

WILL MARK BRAINLIEST AND RATE 5 STARS, PLEASE HELP, 50 POINTS

2 answers:

8 0

You're using inverse operation to solve this equation. Now you just have to think about it. What number plus 20 would equal the same number squared? The answer would be 5, since
5+20=5^2
25=25
The statement above is true :)
Another number that would work for the equation would be x= -4
-4+20=-4^2
16=16
The statement above is also true so your answer would be x=-4 and 5

KATRIN_1 [288]3 years ago

8 0

"I am going to explain this using the substitution method, considering it appears to be the best in this situation.We know (from the bottom equation) that y can equal 3x+20. Using this knowledge, we substitute the y in the top equation for 3x+20. Now, we have an equation that looks like this:3x+20=x^2+2xNow we need to move x to one side and then do some radicals (square roots).Subtract the 2x on the right (since it is smaller, negatives = NONONO), which will give youx+20=x^2Now, we take the square root of both sides to get rad(x+20)=xNow we have to simplify. 20 doesn't have a square root, but 4 goes into 20, and 4 has a square root of 2. This now becomes2rad(x+5)"

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2 (10- 22x0) = (2x + 2)

Lorico [155]

Answer:

x=9

Step-by-step explanation:

2(10-22×0)=(2x+2)

Applying BODMAS

2(10-0)=(2x+2)

2(10)=2x+2

2x+2=20

2x=20-2

2x=18

x=9

3 0

2 years ago

PLS help me Order four and seven tenths repeating, negative four and eight ninths, 490%, and −4.9 from least to greatest.

Digiron [165]

The order from least to greatest negative four and seven tenths repeating, negative four and eight ninths, 490%, and −4.9 from least to greatest is; option A

−4.9,
negative four and eight ninths
four and seven tenths repeating
490%,

<h3>Ascending order</h3>

four and seven tenths repeating

= 4.77777777

negative four and eight ninths

= -4 8/9

= -4.888888888888888

490%

= 490/100

= 4.9

−4.9

Rearranging from least to greatest (ascending order)

-4.9
-4.888888888888888
4.77777777
4.9

Learn more about ascending order;

brainly.com/question/12783355

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6 0

2 years ago

joan weighs 3 kg more than her sister amy and their total weight is 92 kg what is the weight of each girl.Answer Asap plsss I ne

Ahat [919]

Joan- 47.5kg sister-44.5kg

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2 years ago

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A scuba diver descends farther down into the ocean from an initial depth of 12.8 feet below sea level. The scuba diver descends

Kay [80]

Answer:

$r \geqslant 10.4$

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2 years ago

5) In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged 5.2 minutes of checkout tim

Ne4ueva [31]

Answer:

$\S^2_p =\frac{(60-1)(3.1)^2 +(72 -1)(2.8)^2}{60 +72 -2}=8.643$

$S_p=2.940$

$t=\frac{(5.2 -6.1)-(0)}{2.940\sqrt{\frac{1}{60}+\frac{1}{72}}}=-1.751$

$df=60+72-2=130$

$p_v =P(t_{130}$

Assuming a significance level of $\alpha=0.05$ we have that the p value is lower than this significance level so then we can conclude that the mean for checkout time is significantly less for people who use the self-service lane