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AveGali [126]
3 years ago
13

What is x for the equation 4x^2-12x=7 (Only one variable for x)

Mathematics
2 answers:
maksim [4K]3 years ago
5 0

Answer:

3.5 or -0.5

Step-by-step explanation:

4x²-12x=7

4x²-12x-7=0

4x²-14x+2x-7=0

2x(2x-7)+1(2x-7)

(2x+1)(2x-7)

x=3.5 or x=-0.5

VARVARA [1.3K]3 years ago
3 0

Answer:

x=-1/2, 7/2

Step-by-step explanation:

move all terms to the left side and set them equal to zero. then set eac factor to zero

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The width of the rectangle is 40% of its length. What is the area of the rectangle?
12345 [234]

Answer:

160in²

Step-by-step explanation:

40% = 0.4 = 4/10

The length is 20, 40% of that is (0.4)(20) = 8in

Length * width . = 20*8 = 160in²

3 0
3 years ago
You are building a new extension and are looking at the plans.referring to the scale, what is the actual measurement of the wall
galina1969 [7]
<span>1:50 scale  means     1cm  on paper and  <span>50cm in real life . So 18x50=900cm
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4 years ago
Read 2 more answers
What is one hundred twenty four percent
never [62]
124% as a decimal:
100% is 1 and 24% is 0.24.
So 124% is 1.24 as a decimal.

124% as a mixed number:
100% is 1 and 24% is 24/100.
To find 124% as a mixed number, simplify 24/100 and add it to 1.
24/100 = 12/50 = 6/25
So 124% as a mixed number is 1 and 6/25.

124% as an improper fraction:
To make 124% an improper fraction, just make the 1 a fraction with the same denominator as 6/25 and add.
1 = 1/1 = 25/25
25/25 + 6/25 = 31/25
So 124% is 31/25 as an improper fraction.

Hope this helps :)
5 0
4 years ago
manuel deposits $10000 for 12 yr in an account paying 4% compounded annually.He then puts this total amount on deposit in anothe
Naddik [55]
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he then turns around and grabs that money and sticks it for another 9 years,

\bf ~~~~~~ \textit{Compound Interest Earned Amount}&#10;\\\\&#10;A=P\left(1+\frac{r}{n}\right)^{nt}&#10;~~&#10;\begin{cases}&#10;A=\textit{accumulated amount}\\&#10;P=\textit{original amount deposited}\to &\$16010.32\\&#10;r=rate\to 5\%\to \frac{5}{100}\to &0.05\\&#10;n=&#10;\begin{array}{llll}&#10;\textit{times it compounds per year}\\&#10;\textit{semi-annually, thus twice}&#10;\end{array}\to &2\\&#10;t=years\to &9&#10;\end{cases}&#10;\\\\\\&#10;A=16010.32\left(1+\frac{0.05}{2}\right)^{2\cdot 9}\implies A=16010.32(1.025)^{18}&#10;\\\\\\&#10;A\approx 24970.64

add both amounts, and that's how much is for the whole 21 years.
6 0
4 years ago
A couple does not wish to spend more than $60 for dinner at a restaurant. if a sales tax of 7% is added to the bill and they pla
Firlakuza [10]
Hey there!

The first step of this problem would be to add together our two percentages, then convert that percentage into a decimal by dividing by 100. 

15% + 7% = 22%

22 ÷ 100 = 0.22

It can be assumed here that 22% of the cost will be added tax and tip. We can use 0.22 to represent that percentage in our problem. Just multiply that decimal by the maximum amount of money they want to spend, $60, to get the amount that will just be tax and tip. Finally, subtract the tax and tip from $60 to find the most they can spend on the meal itself. 

60 × 0.22 = 13.20

60 – 13.20 = 46.80

The total amount they can spend is 46.80. 

Hope this helped you out! :-)
5 0
3 years ago
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