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2 years ago

PLEASE HELP!!!!!!!! I. NEED. AN. ANSWER. LIKE. RIGHT. NOW!!!!!!!!!!

Mathematics

2 answers:

Alex787 [66]2 years ago

6 0

Butter brick and clay

Oak and wheat would float this is and ez
Problem

AVprozaik [17]2 years ago

5 0

Answer:

butter brick and clay sink

oak and wheat float

Step-by-step explanation:

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Compare standard deviation and residual analysis<br><br> Describe when/how each are used.

Alexandra [31]

Answer:

standard deviation is a quantity calculated to indicate the extent of deviation for a group as a whole.

Residual analysis is used to assess the appropriateness of a linear regression model by defining residuals and examining the residual plot graphs.

Step-by-step explanation:

6 0

3 years ago

The difference between the roots of the equation 3x2+bx+10=0 is equal to 4 1 3 . find<br> b.

inna [77]

Given that the difference between the roots of the equation $3x^2+bx+10=0$ is $4 \frac{1}{3} = \frac{13}{3}$ .

Recall that the sum of roots of a quadratic equation is given by $- \frac{b}{a}$ .

Let the two roots of the equation be $\alpha$ and $\alpha + \frac{13}{3}$ , then

$\alpha + \alpha + \frac{13}{3} =2 \alpha + \frac{13}{3} =- \frac{b}{a} =- \frac{b}{3} \\ \\ i.e.\ \ 2 \alpha + \frac{13}{3}=- \frac{b}{3}$ . . . (1)

Also recall that the product of the two roots of a quadratic equation is given by $\frac{c}{a}$ , thus:

$\alpha \left( \alpha + \frac{13}{3} \right)= \alpha ^2+ \frac{13}{3} \alpha = \frac{c}{a} = \frac{10}{3} \\ \\ i.e.\ \ \alpha ^2+ \frac{13}{3} \alpha=\frac{10}{3}$ . . . (2)

From (1), we have:

$2 \alpha =- \frac{b}{3} - \frac{13}{3} \\ \\ \Rightarrow \alpha =- \frac{b}{6} - \frac{13}{6}$

Substituting for alpha into (2), gives:

$\left(- \frac{b}{6} - \frac{13}{6}\right)^2+ \frac{13}{3} \left(- \frac{b}{6} - \frac{13}{6}\right)= \frac{10}{3} \\ \\ \Rightarrow \frac{b^2}{36} + \frac{13b}{18} + \frac{169}{36} - \frac{13b}{18} - \frac{169}{18} = \frac{10}{3} \\ \\ \Rightarrow \frac{b^2}{36} - \frac{289}{36} =0 \\ \\ \Rightarrow \frac{b^2}{36} = \frac{289}{36} \\ \\ \Rightarrow b^2=289 \\ \\ \Rightarrow b=\pm\sqrt{289}=\pm17$

5 0

3 years ago

What is 7 1/2+6 5/8 and can you show your work

PtichkaEL [24]

The answer is going to be 14.125 in decimal form

8 0

3 years ago

What is 1/6 of 11/12 reduce it to

lara [203]

11/12* (1/6)
= 11/72.

The final answer is 11/72~

7 0

3 years ago

A small theater had 9 rows of 25 chairs each. An extra 7 chairs have just been brought in. How many chairs are in the

Alchen [17]

Answer:

232

Step-by-step explanation:

9 x 25 = 225 225 + 7 = 232

another way to find it

9 x 20 = 180 9 x 5 = 45 180 + 45 = 225 + 7 = 232

8 0

3 years ago