( 2x² - 4) - ( 5x² + 2 ) + ( 7x² - 5) = ( 2x² - 4 - 5x² - 2 + 7x² - 5)
= (2x² - 5x² + 7x² - 4 - 2 - 5)
= 4x² - 11
Answer:
Pre calculus is the study of the mathematical prerequisites for calculus, including algebra, trigonometry and analytical geometry. ... For example, the self-paced Khan Academy precalculus course includes trigonometry, conic sections, vectors, matrices, complex numbers, probability and series.
Answer:
x>3
Step-by-step explanation:
8x-6>12+2x
Subtract 2x from each side
8x-2x-6>12+2x-2x
6x -6 > 12
Add 6 to each side
6x-6 +6 > 12+6
6x> 18
Divide each side by 6
6x/6 >18/6
x>3
Answer: It will take 6 years for 7500 grams of X to reach 6900 grams.
Step-by-step explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.


b) for 7500 g to reach to 6900 g


It will take 6 years for 7500 grams of X to reach 6900 grams.
The answer would be 15+$5.50(9)=$64.50 is less than $12+$6.25(10)= 74.50