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OverLord2011 [107]
3 years ago
6

3x^2- 10x - 8 please help with this

Mathematics
2 answers:
fgiga [73]3 years ago
8 0
So why I now yes when she where it go to get the stuff
Nataly [62]3 years ago
4 0
B^2 - 4xaxc
a=3 b= -10 c= -8

(-10)^2 -4 x3 x (-8)

100 + 96

196

Sqrt(196) = 14

x1 = (-b-sqrt(196))/2a
x1= (10-14)/6
x1= -2/3

x2 = (-b+sqrt(196))/2a
x2 = (10+14)/2a
x2= 4
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calculate the rate per litre of which a car uses petrol if it uses 20 litre of petrol to travel 180 km​
topjm [15]

Answer:

9km per litre

Step-by-step explanation:

Rate=180km/20l

Rate=9 km/l

5 0
3 years ago
On a farm there are some cows and some chickens. If the animals have a total of 40 head and 112 legs, how many cows are there?
emmainna [20.7K]
\frac{112-2*40}{2}\\\frac{112-80}{2}\\\frac{32}{2}\\16

16 cows and 24 chickens.
7 0
4 years ago
Rich’s weekly salary is based on the number of pairs of shoes he sells. He is paid a base salary of $25, plus $5 for every pair
Xelga [282]

Answer: option A is the correct answer.

Step-by-step explanation:

s represents the number of pairs of shoes that Rich's sells.

P represents the total pay from selling s pairs of shoes.

He is paid a base salary of $25, plus $5 for every pairs of shoes he sells.

The relationship between his pay and pairs of shoes sold can be represented by the linear equation which is expressed as

p = 25 + 5s

For a week in which he sold 7 pairs of shoes, his total pay would be

p = 25 + 5 × 7

p = 25 + 35

p = $60

4 0
3 years ago
Divide 33 photos into two groups so the ratio is 4:7
Alenkinab [10]
I think the answer is 16.5 sorry if its not right
8 0
3 years ago
Solve the simultaneous equations:<br><br> 3a-2b=14 <br> 12a+9b=39
kirill [66]
Use elimination
Multiply first equation by 4
12a - 8b = 56
12a + 9b = 39
Subtract both
-17b = 17
b = -1
Plug in -1 for b
3a - 2(-1) = 14
3a = 12, a = 4
Final answer: a = 4, b = -1
5 0
3 years ago
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