A is the right answer 3+5 is 8 plus 2 is 10. 2+3 is 5 plus 5 is 10
Answer:
Step-by-step explanation:
3x-7=23
<=> 3x = 23 + 7
<=> 3x = 30
<=> X = 30 ÷ 3
<=> X = 10
the Answer C: 4
Step-by-step explanation:
Answer: 5 s
Step-by-step explanation:
Given
Height of the rocket can be modelled as 
Rocket will land on earth when it's height becomes 0

Neglecting 0 value
Thus, rocket remains in air for 5 s.
The mass of hydrogen atoms that measures 54 u is 89.64 x 10^-24
Analysis:
If 1 u = 1.66 x 10^-24, then 54 u = 54 x 1.66 x 10^-24 = 89.64 x 10^-24
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