Answer:
s=650
Step-by-step explanation:
s=n/2(2a+(n-1)d)
s=20/2[2x4+(20-1)3]
s=20/2(2x4+19x3)
s=20/2(8+57)
s=20/2x65
s=10x65
s=650
Answer:
D. 10x - 20
Step-by-step explanation:
The perimeter is the sum of all the sides of the rectangle.
Set up your equation. Because the opposite sides of the rectangle are equal, you add them twice or multiply it by 2.
P = 2(2x - 8) + 2(3x - 2)
Now distribute the 2 across the parentheses.
P = 4x - 16 + 6x - 4
Combine the variables.
P = 10x - 16 - 4
Combine the constants.
P = 10x - 20
Answer:
The cost of chair is
The cost of a lamp is
The cost of a table is
Step-by-step explanation:
Let
x----> the cost of chair
y----> the cost of lamp
z----> the cost of table
we know that
----> equation A
-----> -----> equation B
------> equation C
substitute equation C and equation B in equation A and solve for x
Find the value of y
Find the value of z
therefore
The cost of chair is
The cost of a lamp is
The cost of a table is
16z-5z =11z
thus the answer is 11z
Answer:
P = 10x³ + 4x² + 8x + 6
Step-by-step explanation:
The perimeter of a rectangle is twice the sum of length and width.
P = 2(L+W) = 2((x³ +2x² -6x +12) +(4x³ +10x -9))
= 2(5x³ +2x² +4x +3) . . . . collect terms inside parentheses
P = 10x³ +4x² +8x +6