Answer:
your answer will be <u>6</u><u>w</u><u>e</u><u>e</u><u>k</u><u>s</u><u> </u><u> </u><u> </u><u> </u>
<u>hope</u><u> </u><u>ur</u><u> </u><u>help</u>
Answer:
11. 78
12. 4x² - 3x - 1
Step-by-step explanation:
11. Sum of n whole numbers = ½(n² + n)
Multiply
½*n² + ½*n
= n²/2 + n/2
To find the sum of the first 12 whole number, substitute 12 for n into the equation.
= 12²/2 + 12/2
= 144/2 + 12/2
= 72 + 6
= 78
12. Area of trapezoid = ½(a + b)*h
Where,
a = 5x - 4
b = 3x + 2
h = x + 1
Area = ½(5x - 4 + 3x + 2)*(x + 1)
Area = ½(8x - 2)*(x + 1)
Area = ½[8x(x + 1) -2(x + 1)]
= ½[8x² + 8x - 2x - 2]
Add like terms
= ½(8x² - 6x - 2)
= ½(8x²) - ½(6x) - ½(2)
= 4x² - 3x - 1
Substitute
12(3) + (52)
12(3) = 36
36 + 52 = 88
Answer:
Number of 1-cm cube 24. Volume of solid 24 cm^2
Step-by-step explanation:
An interger may be +460 because profit means to increase. So the answer is +460.
~JZ
