Answer:
190 chairs
Step-by-step explanation:
-This is an arithmetic progression with the first term a=10, the common difference is d=2 and the number of terms n=10.
-The sum of n terms in the progression can be calculated as follows:
Where
is the sum of the progression's terms.
are the first and last terms of the progression.
#We calculate as below:
#We then substitute to calculate the sum of the terms:
Hence, 190 chairs are needed for the 10 rows.
Answer:
y=4x+9
Step-by-step explanation:
from -11 to 1 is 12 units and from -5 to -2 is 3
slope 12/3 can be simplified to 4/1 or 4
now we have y=mx y=4x now we need b
to get to the y intercept i looked at 1,-2 and used the slope 2 times making the int. 9
The formula for a semi-circle is 3.14*d / 2 + the triangle
and d= 20 because the triangle is a equilateral so 3.14*20=62.8 and divide by 2 for it is the half of the circle 62.8 / 2 = 31.4 and add the triangle 31.4+40 because of the 2 sides 31.4+40=70.4
Answer:
C. 6√5
Step-by-step explanation:
√20 +√80= √4*5 + √16*5 = 2√5 + 4√5 = 6√5
The greatest common factor is 3y.
9 - 1,3,9
12 -1,3,4,12
There is a y in both terms.
So, 3y is the greatest common factor.