Answer:
620
Step-by-step explanation:
The formula to find the sum of the first n terms of an arithmetic sequence is n(a1 + aN)/2, where n is the number of terms, aN is the last term and a1 is the first term. We do not know the last term, though, so we must find it. The equation for this is an=a1+(n−1)d, where d is the common difference and a1 is the first term, and n is the number of terms. Therefore, the last term, an is, -7+(19)4 = 69.
Finally, we plug it into the first formula, the formula to find the sum, and we get 20*(-7+69)/2, which gives us 620 as our final answer.
Answer:
"Process is shown below"
Step-by-step explanation:
Since collinear, they are on the same line. They are positioned as below:
B-----------------------A-------------------C
AB, BC, and AC's expressions are given.
To find BC, first looking at the picture, we can say:
BC = AB + AC
Putting the expressions and solving for x:
7x+5 = 4x - 3 + 5x - 16
7x + 5 = 9x - 19
19 + 5 = 9x - 7x
24 = 2x
x = 12
1. BC = 7x + 5 = 7(12) + 5 = 89
2. AB = 4x - 3 = 4(12) - 3 = 48 - 3 = 45
3. AC = 5x - 16 = 5(12) - 16 = 60 - 16 = 44
Shown
90 degrees it would be considered a right angle. You can see that if you turn the page a little and if the ABD is 190 and the other would be 66 degrees then the ABE would be the 90
Answer: 18°F
Step-by-step explanation: if you add 21 and -3 you get 18
