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3 years ago

20 point to the first one who get this right!!

Mathematics

1 answer:

stepan [7]3 years ago

4 0

Answer:

A) 134

15 miles I believe

Step-by-step explanation:

because 71.1 + 55.6 = 126.7- 262.5 = 134.8

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9/20

Stella [2.4K]

Question:

Find the number of real number solutions for the equation. x^2 + 5x + 7 = 0

Answer:

The number of real solutions for the equation $x^{2}+5 x+7=0$ is zero

Solution:

For a Quadratic Equation of form : $a x^{2}+b x+c=0$ ---- eqn 1

The solution is $x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}$

Now , the given Quadratic Equation is $x^{2}+5 x+7=0$ ---- eqn 2

On comparing Equation (1) and Equation(2), we get

a = 1 , b = 5 and c = 7

In $x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}$ , $b^2 - 4ac$ is called the discriminant of the quadratic equation

Its value determines the nature of roots

Now, here are the rules with discriminants:

1) D > 0; there are 2 real solutions in the equation

2) D = 0; there is 1 real solution in the equation

3) D < 0; there are no real solutions in the equation

Now let solve for given equation

$D= b^2 - 4ac\\\\D = 5^2 - 4(1)(7)\\\\D = 25 - 28 \\\\D = -3$

Since -3 is less than 0, this means that there are 0 real solutions in this equation.

4 0

4 years ago

Easy geometry question about rhombus/measures :))

OLEGan [10]

Answer:

∠1 = 51

∠2= 51

∠3= 39

∠4= 51

3 0

3 years ago

Tell whether the shapes are similar explain your answer

Luda [366]

Yes you can assume they are similar because the sides that correspond with one another are half of the big triangles measurements. 16/2=8 12/2=6 etc.

7 0

3 years ago

If tan x=.67, and cos x=.83, what is sin x

Alexxandr [17]

Answer:

0.56

Step-by-step explanation:

sin x

tan x is defined as -------------

cos x

and we can solve this for sin x: sin x = (cos x)(tan x)

which here is: sin x = 0.83(0.67) = 0.56 (rounded up from 0.5561)

7 0

4 years ago

Find the measure of Z CFD.СF5m + 116T3m + 80D

leva [86]

$\begin{gathered} 5m+116+3m+80=180 \\ 8\text{m=180-116-80} \\ 8m=-16 \\ m=-2 \\ \text{CFD}=5m+116 \\ \text{CFD}=5\times(-2)+116 \\ \text{CFD}=-10+116 \\ \text{CFD}=106 \end{gathered}$

7 0

1 year ago