All categories

3 years ago

Find x when - 1/2 + x = - 21/4

Mathematics

1 answer:

lbvjy [14]3 years ago

4 0

Step-by-step explanation:

-1 / 2 + x = -21 /4

x = -21/4 + 1/2

x = (-21 + 2)/4

x = -19/4

You might be interested in

What 2 numbers add to get 2 and multiply to 4

rusak2 [61]

Factor 4
4=1 times 4
2 times 2
they don't add to 2
set up equation
x+y=2
xy=4

first equation, subtract x from both sides
y=2-x
subsitute for y
x(2-x)=4
distribute
2x-x^2=4
add x^2
2x=x^2+4
subtract 2x
0=x^2-2x+4
use quadratic formula which is
if you have ax^2+bx+c=0 then
x= $\frac{ -b+/-\sqrt{b^{2}-4ac} }{2a}$ so

1x^2-2x+4=0
a=1
b=-2
c=4
x= $\frac{ -(-2)+/-\sqrt{(-2)^{2}-4(1)(4)} }{2(1)}$
x= $\frac{ 2+/-\sqrt{4-16} }{2}$
x= $\frac{ 2+/-\sqrt{-12} }{2}$
we have $\sqrt{-12}$ and that doesn't give a real solution
therefor there are no real solutions
but if you want to solve fully
x= $\frac{ 2+/-2\sqrt{-3} }{2}$
i= $\sqrt{-1}$
x= $\frac{ 2+/-2i\sqrt{3} }{2}$
x= $1+/-i\sqrt{3}$
x= $1-i\sqrt{3}$ or x= $1+i\sqrt{3}$ (those are the 2 numbers)

6 0

3 years ago

What is 49% of 849 ?

Sholpan [36]

Answer:

416.01

Step-by-step explanation:

49% is the same as 0.49

0.49 × 849 is 416.01

6 0

2 years ago

For a population with u=100 and a=20, what is the z-score that corresponds to x=90?

max2010maxim [7]

I guess that u = μ & that a=σ. If so:

μ =100 & that σ =20 & x=20

Z score = (x-μ) / σ ==> Z score = (90-100)/20 ==> Z = - 0.5

3 0

3 years ago

The graph shows a square root function. A curve starts on the y-axis in quadrant 4 and goes into quadrant 1. The curve opens dow

Naily [24]

Answer:

A and B are the answers on Edge.

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Let g(x) = 3x + 2. If g(x) = 11, what is x?

astraxan [27]

Answer:

3=x

Step-by-step explanation:

11=3x+2

5 0

2 years ago