All categories

2 years ago

which of the following statements must be true about an equation before you can use the quadratic formula to find the solutionsl

Mathematics

1 answer:

Pepsi [2]2 years ago

8 0

I don't see anything? Perhaps you need a, b & c values to start

You might be interested in

Help with circle measurements asap plzzzz

antoniya [11.8K]

Answer:according to the formula of inscribed angle theorem

$3x + 22 = \frac{1}{2 } \times 134$

$3x + 22 = 67$

$3x = 67 - 22$

$3x = 45$

$x = \frac{45}{3}$

$x = 15$

The answer is 15 degrees

3 0

2 years ago

Which graph represents the equation x=-2

mixas84 [53]

graph c

because the graph x = -2 is a vertical line at -2 on the x axis

6 0

2 years ago

If f(x)=2x+7 and g(x)=11x-4, find (f+g)x.

klemol [59]

Answer:

(f+g)(x) = 13x + 3

Step-by-step explanation:

Rewrite f(x)=2x+7 and g(x)=11x-4 in columns, as follows:

f(x)=2x+7

+g(x)=11x-4

----------------

Now add each column separately.

f(x)+g(x) = (f+g)(x) ("the sum of functions f and g")

2x + 11x = 13x, and, finally, 7-4 = 3.

Therefore,

f(x)=2x+7

+g(x)=11x-4

----------------

(f+g)(x) = 13x + 3

7 0

2 years ago

If we wanted to create a new 90% confidence interval from a different sample for the proportion of those with a two on one date

slava [35]

Answer: 271

Step-by-step explanation:

The formula we use to find the sample size is given by :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

, where $z_{\alpha/2}$ is the two-tailed z-value for significance level of $(\alpha)$

p = prior estimation of the proportion

E = Margin of error.

If prior estimation of the proportion is unknown, then we take p= 0.5 , the formula becomes

$n=0.5(1-0.5)(\dfrac{z_{\alpha/2}}{E})^2$

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2$

Given : Margin of error : E= 0.05

Confidence level = 90%

Significance level $\alpha=1-0.90=0.10$

Using z-value table , Two-tailed z-value for significance level of $0.10$

$z_{\alpha/2}=1.645$

Then, the required sample size would be :

$n=0.25(\dfrac{1.645}{0.05})^2$

Simplify,

$n=270.6025\approx271$

Hence, the required minimum sample size =271

3 0

3 years ago

Question set 2: Many species of terrestrial tree frogs that hibernate at or near the ground surface can survive prolonged exposu

joja [24]

Answer:

0.86

Step-by-step explanation:

The z-score we need to make the comparison is given by

$\bf z=\frac{-2.05-(-2)}{\sigma/\sqrt{n}}$

where

$\bf \sigma$ = the standard deviation established in the study

n = the sample size

$\bf z=\frac{-2.05-(-2)}{0.3/\sqrt{42}}=-1.0801$

and for the Normal distribution N(0,1) we want to find

By using a spreadsheet or the table attached, we find that

P(X > -1.0801) = 0.86

(See picture attached)

7 0

3 years ago