I want the answer of first and last question not middle question answer

Chemistry

2 answers:

leva [86]2 years ago

7 0

the first one is ideal

I'm not sure about the last one sorry

son4ous [18]2 years ago

6 0

Answer:

First question:

b. Ideal machine

last question:

a. 9 × 10^10 J

Explanation:

${ \bf{E = m {c}^{2} }} \\ { \sf{E = (1 \times {10}^{ - 6} ) \times {(3 \times 10 {}^{8}) }^{2} }} \\ { \sf{E = 9 \times {10}^{10} \: joules }}$

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What is 30-9x2*2-21-4+4

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Answer:
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Explanation:
The given expression is:
30 - 9x²*2 - 21 - 4 + 4
The first step is to compute the multiplication. This will give:
30 - 18x² - 21 - 4 + 4
Then, we will add like terms as follows:
(30-21-4+4) - 18x²
= 9 - 18x²
Finally, we can take the 9 as a common factor from both terms, this will give:
9 (1-2x²)

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