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3 years ago

Which expression is equivalent to -1.3 - (-1.9)

Mathematics

1 answer:

Verdich [7]3 years ago

5 0

Answer:

-8-(-1)-5

Step-by-step explanation:

(Hope this helps can I pls have brainlist (crown) ☺️)

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ValentinkaMS [17]

Answer:

it's 512

Step-by-step explanation:

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3 years ago

Solve for a: a + 1 > 7

g100num [7]

Answer:

$a>6$

Step-by-step explanation:

1) Subtract 1 from both sides.

$a>7-1$

2) Simplify 7 - 1 to 6.

$a>6$

Therefor, the answer is a > 6.

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3 years ago

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3 years ago

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Use the definition of a derivative to find f’(x).

tatyana61 [14]

Answer:

f'(x) = $-\frac{9}{x^2}$

Step-by-step explanation:

i) f(x) = 9 / x

ii) f'(x) = $$\lim_{h\to 0} \frac{f(x+h) - f(x)}{h} $ \hspace{0.2cm}$

$= $\lim_{h\to 0} \frac{\frac{9}{x+h} - \frac{9}{x} }{h} = \hspace{0.1cm} $\lim_{h\to 0} \frac{9x - 9(x+h)}{hx(x+h)} $ \hspace{0.1cm} = \hspace{0.1cm}$\lim_{h\to 0} \frac{-9h}{hx(x+h)} = $\lim_{h\to 0} \frac{-h}{x(x+h)} = \frac{-9}{x^2}$$

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3 years ago

Use the quadratic formula to find the solutions to the quadratic equation below 2x^2-5x+5=0

Serggg [28]

Answer:

x = (5 + i sqrt(15))/4 or x = (5 - i sqrt(15))/4

Step-by-step explanation:

Solve for x:

2 x^2 - 5 x + 5 = 0

Hint: | Using the quadratic formula, solve for x.

x = (5 ± sqrt((-5)^2 - 4×2×5))/(2×2) = (5 ± sqrt(25 - 40))/4 = (5 ± sqrt(-15))/4:

x = (5 + sqrt(-15))/4 or x = (5 - sqrt(-15))/4

Hint: | Express sqrt(-15) in terms of i.

sqrt(-15) = sqrt(-1) sqrt(15) = i sqrt(15):

Answer: x = (5 + i sqrt(15))/4 or x = (5 - i sqrt(15))/4

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4 years ago