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victus00 [196]
3 years ago
6

Element X is a radioactive isotope such that every 91 years, its mass decreases by half. Given that the initial mass of a sample

of Element X is 80 grams, how long would it be until the mass of the sample reached 68 grams, to the nearest tenth of a year?
Mathematics
1 answer:
vaieri [72.5K]3 years ago
7 0

Answer:

21.3

Step-by-step explanation:

Delta math answer.

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If x−2=13, then what is the value of x2−4x+4?
Rus_ich [418]

Answer:

169

Step-by-step explanation:

x−2=13

First find the value of x

x-2+2 = 13+2

x = 15

Now substitute into the expression

x^2 -4x+4

15^2 -4*15+4

225 - 60+4

165+4

169

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Find the total mass of the triangular region shown below. All lengths are in cm, and the density of the region is sigma(x) = 1 +
anastassius [24]

Answer:

3 grams

Step-by-step explanation:

We are going to take the mass of a bunch of little strips below the triangle "roof." To do this, we must figure out what formula for the mass we'll use, in this case, we'll use:

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now, because the "roof" of the triangle contains two different integrals (it completely changes direction), we will use TWO integrals!

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Mass of left part = lim x->0 ∈ (1+x)*y*deltax = inegral 0 to 1 of (1+x)*3*(-x+1) = 3 * integral 0 to 1 of (-x^2 + 1) = 3 * 2/3 = 2

Total mass = mass left + mass right = 1 + 2 = 3 grams

8 0
3 years ago
Simplify each expression by distributing and combined bf like terms (SHOW WORK) please
Dafna1 [17]

Answer:

c-39

1. rearrange terms

2.distribute

3.distribute

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6.multiply by 1

8 0
3 years ago
In a relay race, Nancy ran her part in 15.25 seconds, John ran his part in 13.8 seconds, Sylas ran his part in 16.4 seconds. Wha
sp2606 [1]

Answer:

45.45

Step-by-step explanation:

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