Answer:
its b
Step-by-step explanation:
Correct question:
a sequence U1, U2,U3...... is defined by the relation
. if U1 =2, find U2 and U3
Answer:
U2 = 9
U3 = 23
Step-by-step explanation:
Given sequence;
![U_{n +1} = 2U_n +5](https://tex.z-dn.net/?f=U_%7Bn%20%2B1%7D%20%3D%202U_n%20%2B5)
U1 = 2
U2 = ?
![U_{n +1} = 2U_n +5\\\\U_2 = 2(U_1) + 5\\\\U_2 = 2(2) + 5\\\\U_2 = 4 + 5\\\\U_2 = 9](https://tex.z-dn.net/?f=U_%7Bn%20%2B1%7D%20%3D%202U_n%20%2B5%5C%5C%5C%5CU_2%20%3D%202%28U_1%29%20%2B%205%5C%5C%5C%5CU_2%20%3D%202%282%29%20%2B%205%5C%5C%5C%5CU_2%20%3D%204%20%2B%205%5C%5C%5C%5CU_2%20%3D%209)
Solving for U3;
![U_3 = 2(U_2) + 5\\\\U_3 = 2(9) + 5\\\\U_3 = 18 + 5\\\\U_3 = 23](https://tex.z-dn.net/?f=U_3%20%3D%202%28U_2%29%20%2B%205%5C%5C%5C%5CU_3%20%3D%202%289%29%20%2B%205%5C%5C%5C%5CU_3%20%3D%2018%20%2B%205%5C%5C%5C%5CU_3%20%3D%2023)
Let's actually find the solution of
<span>2x - 6y = 8
-x + 3y = 10
Let's use the addition/subtraction method. Multiply the 2nd equation by 2, obtaining
</span> 2x - 6y = 8
-2x + 6y = 20
--------------------
0 + 0 = 28
Since this can never be true, the system of linear equations
2x - 6y = 8
-x + 3y = 10
has no solution.
Answer:
y = 13/3
Step-by-step explanation:
substitute y=2x+5 in x+y = 4
x+2x+5 = 4
3x+5=4
3x= -1
x= -1/3
substitute x= 1-/3 in x+y = 4
-1/3 +y = 4
y = 13/3
Answer:
The submarine gains 120 feet of elevation per minute.
Step-by-step explanation: