Answer: y= -10
Step-by-step explanation:
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Will someone help me please please please please :D
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❄ Hi there,
keeping in mind that the sum of complementary angles is 90°,
set up an equation, letting be x –
{and we know that
}
__________
Keeping in mind that a right angle is 90°,
set up an equation, letting be x:
{and we know that
}
❄
Answer:
Step-by-step explanation:
we are given half-life of PO-210 and the initial mass
we want to figure out the remaining mass <u>after</u><u> </u><u>4</u><u>2</u><u>0</u><u> </u><u>days</u><u> </u>
in order to solve so we can consider the half-life formula given by
where:
- f(t) is the remaining quantity of a substance after time t has elapsed.
- a is the initial quantity of this substance.
- T is the half-life
since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5
thus substitute:
reduce fraction:
By using calculator we acquire:
hence, the remaining sample after 420 days is 0.625 kg