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
Answer:
1 1/2 kg de queso
Step-by-step explanation:
De la pregunta anterior, sabemos que:
1 queso = 1/4 kg
6 quesos = x kg
Multiplicar cruzada
1 queso × x kg = 6 quesos × 1/4 kg
x kg = 6 quesos × 1/4 kg / 1 queso
x kg = 3/2 kg
x kg = 1 1/2 kg de queso
Answer: Pt1= Only x=5
Pt2=Is not x=5 is an extraneous solution though I believe It is x=-2 is an extraneous solution
Step-by-step explanation:
52+25=77+25=102+25=127
16+36=53+37=90+37=127
Answer 3 weeks
You can put "3 or 4" which is in your multiple choice :)
