Answer:
<h2>y = 0</h2>
Step-by-step explanation:
x + 3y = 28
Put x = 28 and solve for y:
28 + 3y = 28 <em>subtract 28 from both sides</em>
28 - 28 + 3y = 28 - 28
3y = 0 <em>divide both sides by 3</em>
3y : 3 = 0 : 3
y = 0
Answer:
14.99 hours
Step-by-step explanation:
The formula for half-life is given as,
R/R' = 2ᵃ/ᵇ...................... Equation 1
Where R= Original mass of sodium-24, R' = mass of Sodium-24 after disintegration, a = Total time taken for sodium-24 to disintegrate, b = half-life of sodiun-24.
Given: R = 1 kg, R' = 0.0156 kg, a = 90 hours
Substitute into equation 1 and solve for b
1/(0.0156) = 2⁹⁰/ᵇ
Taking the log of both side
log[1/(0.0156)] = log(2⁹⁰/ᵇ)
log[1/(0.0156)] = 90/b(log2)
90/b = log[1/(0.0156)]/log2
90/b = 6.0023
b = 90/6.0023
b = 14.99 hours
b = 14.99 hours.
Hence the half-life of Sodium-24 is 14.99 hours
Line AB would be 18
line BC would be 15
line CA would be 21
just draw the same triangle but do those labels.
Answer:
1,243.88 units² I think
Step-by-step explanation:
22 x 22 = 484
A = (3.14 x 11²)2 = 759.88
759.88 + 484 = 1,243.88 units²
The values of (x, y) are (-5, 1), if the equations and are solved by elimination method.
Step-by-step explanation:
The given is,
................................(1)
.....................................(2)
Step:1
Equation (2) is multiplied by -1 ( Eqn (2) × -1 )
..................................(3)
Step:2
Substrate the equation (1) and equation (3),
( - )
After the Subtraction equation becomes,
Step:3
By using y value find value of x,
Step:4
Check for solution,
Both sides are equal so answer is corrected
Result:
The values of (x, y) are (-5, 1), if the equations and are solved by elimination method.