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3 years ago

-16/5x-1/4(6.4)+13/5x>-1.6

Mathematics

1 answer:

DIA [1.3K]3 years ago

4 0

Answer: X<0

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Consider the first five steps of the derivation of the Quadratic Formula.

lara31 [8.8K]

Answer:

Full proof below

Step-by-step explanation:

$\displaystyle ax^2+bx+c=0\\\\ax^2+bx=-c\\\\x^2+\biggr(\frac{b}{a}\biggr)x=-\frac{c}{a}\\\\x^2+\biggr(\frac{b}{a}\biggr)x+\biggr(\frac{b}{2a}\biggr)^2=-\frac{c}{a}+\biggr(\frac{b}{2a}\biggr)^2\\\\x^2+\biggr(\frac{b}{a}\biggr)x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}\\ \\\biggr(x+\frac{b}{2a}\biggr)^2=-\frac{4ac}{4a^2}+\frac{b^2}{4a^2}\\ \\\biggr(x+\frac{b}{2a}\biggr)^2=\frac{b^2-4ac}{4a^2}\\ \\x+\frac{b}{2a}=\pm\frac{\sqrt{b^2-4ac}}{2a}\\ \\x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

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2 years ago

Walt grew 10 cm in 1 year. He is now 1.6 m tall. How tall was he 1 year ago?

wlad13 [49]

10cm is the same as point 1 meter so 1.6 minus point 1 is 1.5

i hope this hp u

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3 years ago

Read 2 more answers

(Math) How do you describe a function? Must be in 3 complete sentences!

Alla [95]

A function could be linear or not. Is the rate of change consistent, increasing, or decreasing? Is does the symbol have one minimum value or maximum value, or several such values?

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3 years ago

Solve for x in the equation;3x +34x -40x=0

saveliy_v [14]

Answer:

x=0

Step-by-step explanation:

3x + 34x - 40x = 0

37x - 40x = 0

-3x = 0

x=0

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3 years ago

Laura collects nickels and dimes she has a total of 47 nickels and dimes she calculated the value of the coins and found out she

Gre4nikov [31]

Answer:

Number of dimes = 34

Number of nickels = 13

Step-by-step explanation:

Total number of coins = 47

Coins are in the form of nickels and dimes.

Value of a nickel = 5 cents

Value of a dime = 10 cents

Total value of coins = $4.05 or 405 cents

To find:

Number of nickels and dimes?

Solution:

Let number of nickels = $x$

Money value of nickels = 5 $x$

Let number of dimes = $y$

Money value of dimes = 10 $y$

Total value of coins = $5x+10y$

This value is given as equal as 405.

As per question statement, the equations can be written as:

$5x+10y = 405 ..... (1)\\x+ y = 47 ...... (2)$

Multiplying equation (2) with 5 and subtracting from equation (1):

$10y - 5y = 405 - 235 \\\Rightarrow 5y = 170\\\Rightarrow y = 34$

Number of dimes = 34

Number of nickels = 47 - 34 = 13

6 0

3 years ago