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1 year ago

7

Solve for the variable. 1) 8 - X-X=-16plsss help me explain me slow

2 answers:

Lesechka [4]1 year ago

6 0

Question: 8 - X-X= -16
Answers: x = 12
Explain:
Collect the terms
8-2x= -16
Move the constant to the right-hand side and change its sign
-2x= -16-8
Calculate the difference
-2x= -24
Divide both sides of the equation by 2
X= 12

Nady [450]1 year ago

3 0

Step-by-step explanation:

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Simplify the expression The root of negative nine over the quantity of three minus two i plus the quantity of one plus five i.

jeka94

This will be:
[√9]/[(3-2i)+(1+5i)]
simplifying the above we get:
√9/(3+1-2i+5i)
=√9/(4+3i)
rationalizing the denominator we get:
√9/(4-3i)×(4-3i)/(4-3i)
=[√9(4-3i)]/(16+9)
=[3(4-3i)]/25
=(12-9i)/25

Answer: (12-9i)/25

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2 years ago

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The mean length of 10 childrens' big finger is 8.1cm.

sergiy2304 [10]

Answer:

The mean length of 10 children's big finger is 8.1 cm

Average length of all the 10 children's finger is (8.1×10) cm = 81 cm.

The mean length of 11 adult's big finger is 14.1 cm

Average length of all the 11 adult's big finger is (14.1×11) cm =155.1

Mean length of these 21 people's big finger is
$\frac{(81 + 155.1)}{21} = 11.242857$
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Which are the roots of the quadratic function f(b) = 62 – 75? Select two options.

elena55 [62]

Answer:

$b = 5 \sqrt{3} \ or\ b = -5 \sqrt{3}$

Step-by-step explanation:

Given

$f(b) = b^2 - 75$

Required

Determine the roots

To get the root of the function, then f(b) must be 0;

i.e. f(b) = 0

So, the expression becomes

$0 = b^2 - 75$

Add 75 to both sides

$75 + 0 = b^2 - 75 + 75$

$75 = b^2$

Take square roots of both sides

$\sqrt{75} = \sqrt{b^2}$

$\sqrt{75} = b$

Reorder

$b = \sqrt{75}$

Expand 75 as a product of 25 and 3

$b = \sqrt{25*3}$

Split the expression

$b = \sqrt{25} *\sqrt{3}$

$b = \±5 *\sqrt{3}$

$b = \±5 \sqrt{3}$

$b = 5 \sqrt{3} \ or\ b = -5 \sqrt{3}$

The options are not clear enough; however the roots of the equation are $b = 5 \sqrt{3} \ or\ b = -5 \sqrt{3}$

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2 years ago