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77julia77 [94]
3 years ago
9

Pleasee help from anyone

Mathematics
2 answers:
Brut [27]3 years ago
6 0

Answer:

discriminant = 120

2 real roots ( or 2 x intercepts)

Step-by-step explanation:

f(x) = -7x^2 +8x+2

The discriminant is

b^2-4ac

Where ax^2 +bx+c

so a = -7  b = 8 and c =2

(8)^2 -4(-7) *(2)

64 +56

120

If the discriminant is >0 we have 2 real roots

If the discriminant =0 we have 1 real root

If the discriminant <0 we have 2 complex root ( or no real roots)

Margaret [11]3 years ago
4 0

Answer:

18 and 22.8 will be your answer

Step-by-step explanation:


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6/15=3/x solve for x
denis23 [38]

Answer:15/2


Step-by-step explanation:


3 0
3 years ago
Read 2 more answers
An electronics company has developed a new hand held device. The company predicts that the start up cost to manufacture the new
alex41 [277]
Profit = revenue - expenses

expenses : 125,000 + 6.50x
revenue : 9x
so to make a profit, ur revenue (income) has to be higher then ur expenses

revenue > expenses
A. ) 9x > 125,000 + 6.50x
9x - 6.50x > 125,000
2.5x > 125,000
x > 125,000 / 2.5
x > 50,000......so they would have to sell at least 50,001 devices to make a profit <==

B.) the cost of making 1 device is 10% more then the company predicted....10% more then 6.50.....6.50(1.10) = 7.15.....this is the new cost of making 1 device <==

9x > 125,000 + 7.15x ....this is the inequality with the 10% more added
9x - 7.15x > 125,000
1.85x > 125,000
x > 125,000 / 1.85
x > 67,567.5......so to make a profit, they would have to sell at least 67,568 devices to make a profit <==


7 0
3 years ago
A person places $262 in an investment account earning an annual rate of 3.7%,
yaroslaw [1]

Answer:

$315.24

Step-by-step explanation:

Principal, P =$262

Rate, r= 3.7% =0.037

Time, t= 5 Years

The Value of the Investment which is compounded continuously is gotten using the formula:

V=Pe^{rt}\\=262*e^{0,037*5}\\=\$315.24

The value of the investment after 5 years is $315.24 to the nearest cent.

3 0
3 years ago
Jen is 4/10 meters taller than her sister. Her sister is 9/10 meters tall. How tall is Jen?
mariarad [96]

Add 4/10 to 9/10.

9/10 + 4/10 = 13/10

Simplify 13/10 into a mixed number by subtracting 10 from the numerator and turning it into a whole.

13/10 ⇒ 1 3/10

<h2>Answer:</h2>

<u>Jen is </u><u>1 3/10 meters</u><u> tall.</u>

5 0
3 years ago
Simplify the expression:<br><br>(6 + 8) + x = 14​
Alex787 [66]

Answer:

x=0 is your answer

Step-by-step explanation:

(6 + 8) + x = 14

14+x=14

x=14-14

x=0

5 0
3 years ago
Read 2 more answers
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