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Juli2301 [7.4K]
3 years ago
7

Hepppppppppppppppppppppppppppppp

Mathematics
1 answer:
vfiekz [6]3 years ago
7 0
You follow the rules for the quadratic formula, where

x= (-b +- √(b²-4ac) )/2a

Filling a, b and c in yields

x = (8 +- √(64-164) ) / 2 =>

x = (8 - √-100)/2 or x = (4 + √-100)/2

Well, √-100 = 10i, so then you simplify to the last answer, D:

x = 4-5i or x=4+5i
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Average after 8 test is 91%. if he gets a 78% on his 9th test what will be the new acerage
Vika [28.1K]
All you need to do is add te averages together then divide them by 2. 91%+78%=169% 169%÷2=84.5% So the new test average is 84.5%
6 0
3 years ago
A third-grade class is told to send a valentine to every single one of their classmates. On Valentine’s Day, the class ends up w
FinnZ [79.3K]
306 is the total cards sent by all the students in the class. Lets say x is the number of students in class, therefore each student needs to send x-1 cards (since they do not send themselves a card). So depending on your level of math, you could either take the complex way to solve it using quadratic equations, or just find the number that if multiplied by itself then subtracted, gives you 306.
(x \times x) - x = 306 \\ lets \: try \: 18 \\ (18 \times 18) - 18 = 306 \\ so \: x = 18
===============
Complex way
(x \times x) - x = 306 \\ {x}^{2} - x - 306 = 0
So a = 1, b = -1, c=-306
using the quadratic equation:
x = \frac{ - b + \sqrt{ {b}^{2} - 4ac } }{2a}
x = \frac{1 + \sqrt{1 - (4 \times 1 \times - 306)} }{2} \\ x = \frac{1 + \sqrt{1 - ( - 1224)} }{2} \\ x = \frac{1 + \sqrt{1225} }{2} \\ x = \frac{1 + 35}{2} \\ x = \frac{36}{2} \\ x = 18
8 0
3 years ago
Read 2 more answers
use opposite operations to solve the folling: iverse of add- subtract- multiply- divide 7+x=21 how am i suppose to do this quest
MAXImum [283]
21-7= 14 so c would be 14
5 0
4 years ago
A hat contains four balls. The balls are numbered 2, 4, 4, and 5. One ball is randomly selected and not replaced, and then a sec
tankabanditka [31]

The description that accurately explains how a fair decision can be made in this situation is : IF a ball with number 4 and 5 are picked you order the largest size, if a ball with number 4 and another with number 4 is picked you order the medium size, but if the balls picked are that of number 2 and 4, then you order a small size. The probability of each result occurring is a fair one.

<h3>Meaning of probability and full working</h3>

Probability is the degree of occurrence of an event. it can also be said to be the chance for an event to occur.

Probability helps us know the chance an event has to occur. The closer it gets to zero(0) the less chance it has to occur. The closer it gets to one(1) the more chance it has to occur.

Learn more about probability: brainly.com/question/14868936

#SPJ1

4 0
2 years ago
46.231 divided by 1000
Roman55 [17]

Answer:

0.046231

just use a calculator my dude

8 0
3 years ago
Read 2 more answers
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