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Citrus2011 [14]
4 years ago
11

How to solve this math equation -9x ≥-90

Mathematics
2 answers:
Ilya [14]4 years ago
4 0
-9x ≥-90

-9x ≥ -90
—- —-
-9 -9

X 10
olga2289 [7]4 years ago
3 0
X<_10. ..............
...
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How can you get equation b from equation A. 3(x+2)=18 B. X+2=18
Rzqust [24]

Answer:

We start with the equation:

A: 3*(x + 2) = 18

And we want to construct equation B:

B: X + 2 = 18

where I suppose that X is different than x.

Because in both equations the right side is the same thing, then the left side also should be the same thing, this means that:

3*(x + 2) = X + 2

Now we can isolate the variable x.

(x + 2) = (X + 2)/3

x = (X + 2)/3 - 2

Then we need to replace x by  (X + 2)/3 - 2 in equation A, and we will get equation B.

Let's do it:

A: 3*(x + 2) = 18

Now we can replace x by =  (X + 2)/3 - 2

3*( (X + 2)/3 - 2 + 2) = 18

3*(  (X + 2)/3 ) = 18

3*(X + 2)/3 = 18

(X + 2) = 18

Which is equation B.

3 0
3 years ago
What are the roots of the quadratic equation below 3x2+15x-5=0
fomenos

Answer:

<h2>A</h2><h2 />

Step-by-step explanation:

3x^2+15x-5=0\\a = 3\\b = 15\\c = -5\\ x = -b\±\frac{\sqrt{b^{2} -4ac} }{2a} \\x = -(15)\±\frac{\sqrt{15^{2} -4(3)(-5)} }{2(3)} \\x = -15 \±\frac{\sqrt{225+60} }{6} \\x = -15\±\frac{\sqrt{285} }{6} = A

8 0
3 years ago
Alex invests £3045 into an account that pays 2.25% compound interest per year.
Inessa [10]
<h2>○=> <u>Correct answer</u> :</h2>

Money in Alex's account after 16 years = \boxed{\bold{\color{plum}£4347.11}}

<h3>○=> <u>Steps to derive correct answer</u> :</h3>

Money invested by Alex = £3045

Percentage of compound interest per annum = 2.25%

We know that :

\tt \: \color{hotpink}A \color{plum} = P {(1 +  \frac{r}{n} )}^{nt}

In this case :

Principal = £3045

Rate = 2.25% = 0.0025

Number of times interest is compounded per year = 1

Time = 16 years

Which means :

Money Alex will have in the account after 16 years :

= \tt3045 ({1 + \frac{ 0.0025}{1} })^{16}

\color{plum}= \tt  £4347.11

Therefore, the money in Alex's account after 16 years = £4347.11

8 0
3 years ago
What is the discount on shirts if shirts cost $24 and there is a discount 25%
MrRissso [65]

Step-by-step explanation:

25% × $24 = $6

Subtract the discount from the original

24 - 6 = $18.00

4 0
3 years ago
Camelo has 3 less siblings than Benecio has. If camelo has 2 siblings, how many siblings does Benicia has.
Yuri [45]

Answer:

Benicia has5 siblings

Step-by-step explanation:

2+3=5

8 0
4 years ago
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