Answer:
-9(9a-10) or 9(-9a+10) (whichever one is correct)
Step-by-step explanation:
Just take out the -9 or 9
Find how long will he take for 1 similar walls (in hour)
1/3 × 3/4
= 3/12
= 1/4 hours
Find how long will he take for 5 similar walls
time for 1 wall × 5
= 1/4 × 5
= 5/4 hours
Distribute the outside terms through the terms inside the parenthesis.
2(x - 4) + 7 = 3
2x - 8 + 7 = 3
Combine like terms.
2x - 1 = 3
Add 1 to both sides of the equation.
2x = 4
Divide both sides by 2.
x = 2
To solve for any given number of variables, you need that number of equations to solve for all variables. When there are only two variables you only need to equations to solve for them both. You eliminate one variable at a time, order does not matter.
y-x=6 and y+x=-10
Since one equation has -x and the other +x, you can simply add the two equations together to eliminate x...
(y-x=6)+(y+x=-10)
y+y-x+x=6-10
2y=-4
y=-2, now you can use this value of y in either original equation to solve for x...
y-x=6, using y=-2 becomes:
-2-x=6
-x=8
x=-8
So the solution to the system of equations is the point (-8, -2)
You can always check by using these two values in the original equations...
y-x=6, -2--8=6, -2+8=6, 6=6
y+x=-10, -2+(-8)=-10, -2-8=-10, -10=-10
Answer:
<h3>The 7th term is
1458</h3>
Step-by-step explanation:
For a geometric sequence
U(n) = ar^n - 1
Where
n is the number of terms
r is the common ratio
a is the first term
From the sequence
a = 2
r = - 6 /2 = -3
U(n) = 2(-3) ^ n - 1
For the 7th term
U(7) = 2(-3) ^ 7 - 1
= 2(-3)^6
The final answer is
= 1458
Hope this helps you