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Lelu [443]
3 years ago
8

If 49% of a number is 56 what was the original numeber

Mathematics
2 answers:
Viktor [21]3 years ago
8 0

Answer:

1.42%

Step-by-step explanation:

let y be the unknown number

49% × y = 49y%

49y% = 56

then the co-efficient of 'y' that is 49% will cancel out leaving 'y' and resulting in 56÷49 resulting in 1.42

therefore the original number is 1.42

pashok25 [27]3 years ago
6 0

Answer:

142.85 (rounded off to two decimal places)

Step-by-step explanation:

given

(49/100)x = 56

x = (56/49)100

x = (8/7)(100)

we get

x= 142.85....

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Determine the number of real solutions for each of the given equations. Equation Number of Solutions y = -3x2 + x + 12 y = 2x2 -
rosijanka [135]

Answer:

Step-by-step explanation:

Our equations are

y = -3x^2 + x + 12\\y = 2x^2 - 6x + 5\\y = x^2 + 7x - 11\\y = -x^2 - 8x - 16\\

Let us understand the term Discriminant of a quadratic equation and its properties

Discriminant is denoted by  D and its formula is

D=b^2-4ac\\

Where

a= the coefficient of the x^{2}

b= the coefficient of x

c = constant term

Properties of D: If D

i) D=0 , One real root

ii) D>0 , Two real roots

iii) D<0 , no real root

Hence in the given quadratic equations , we will find the values of D Discriminant  and evaluate our answer accordingly .

Let us start with

y = -3x^2 + x + 12\\a=-3 , b =1 , c =12\\D=1^2-4*(-3)*(12)\\D=1+144\\D=145\\D>0 \\

Hence we have two real roots for this equation.

y = 2x^2 - 6x + 5\\

y = 2x^2 - 6x + 5\\a=2,b=-6,c=5\\D=(-6)^2-4*2*5\\D=36-40\\D=-4\\D

Hence we do not have any real root for this quadratic

y = x^2 + 7x - 11\\a=1,b=7,-11\\D=7^2-4*1*(-11)\\D=49+44\\D=93\\

Hence D>0 and thus we have two real roots for this equation.

y = -x^2 - 8x - 16\\a=-1,b=-8,c=-16\\D=(-8)^2-4*(-1)*(-16)\\D=64-64\\D=0\\

Hence we have one real root to this quadratic equation.

7 0
2 years ago
Please solve!! solve for y 3x-y=16<br><br> Will name the Brainliest!!
algol [13]

Answer:

y= 5.333

Step-by-step explanation:

4 0
2 years ago
ANSWER QUICKLY
denis23 [38]
The answer is 1/3 because I just took the test
4 0
3 years ago
If (ax+2)(x+b) = 3x^2 + 5x + c for all values of x, what is the value of c?
mr Goodwill [35]

Answer: is it 0.258

Step-by-step explanation:

4 0
3 years ago
Is there any app which helps solve pure maths questions?​
allochka39001 [22]

Answer:

math a app good luck with the question

4 0
2 years ago
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