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3 years ago

X^2+10x+5=30 quadratic equation

1 answer:

4 0

First subtract 30 from both sides so it is equal to 0

the quadratic formula is -b plus or minus sqrt of (b^2 - 4ac) all over 2a so
-10 plus or minus sqrt (100-25) all over 2
this is equivalent to

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I Need help please help me

Lelechka [254]

Answer:

Step-by-step explanation:

if you take

the given number and subtract them from the value you get when you multiply then you get -2

6 0

4 years ago

Read 2 more answers

What is the sum of this infinite geometric series?

barxatty [35]

$\qquad \qquad \textit{sum of an infinite geometric sequence} \\\\ \displaystyle S=\sum\limits_{i=0}^{\infty}\ a_1\cdot r^i\implies S=\cfrac{a_1}{1-r}\quad \begin{cases} a_1=\stackrel{\textit{first term}}{\frac{1}{8}}\\ r=\stackrel{\textit{common ratio}}{\frac{2}{3}}\\ \qquad -1 < r < 1 \end{cases}$

$\displaystyle\sum_{k=0}^{\infty} ~~ \underset{a_1}{\frac{1}{8}}\underset{r}{\left( \frac{2}{3} \right)}^k\implies S=\cfrac{ ~~ \frac{1}{8} ~~ }{1-\frac{2}{3}}\implies S=\cfrac{ ~~ \frac{1}{8} ~~ }{\frac{1}{3}}\implies S=\cfrac{3}{8}$

4 0

1 year ago

A teacher collected information from a class of 25 students about the time, in hours, they spent studying the previous week and

amm1812

Answer:

Correlation will not change.

Correlation coefficient = -0.72

Step-by-step explanation:

We are given the following in the question:

Correlation coefficient between hours spent studying and hours spent on the Internet = -0.72

Properties of correlation coefficient:

Correlation is a technique that help us to find or define a relationship between two variables.
It is a measure of linear relationship between two quantities.
It is not affected by the units of the variable or change in units of the variable.

Thus, if the units of each variable is changed from hours to minutes, the correlation coefficient remains the same between minutes studying and minutes spent on the Internet.

5 0

4 years ago

Look at the cups shown below (please note images are not drawn to scale): A cone is shown with width 2 inches and height 4 inche

GaryK [48]

I think I cup b is the heavyset

8 0

3 years ago

X+y=2 equal to x-y=8

Whitepunk [10]

Answer:

x = 5

y = - 3

Step-by-step explanation:

x + y = 2

x - y = 8

add

x + x + y - y = 2 + 8

2x = 10

x = 5

replace x

5 + y = 2

y = 2 - 5

y = - 3

7 0

3 years ago