-4+3x= 2x +3x +3
-4-3= 2x + 3x -3x
-7 =2x
X= -7/2
The missing X value equals 5. The triangle was dilated by a scale factor of 3 and 15 / 3 = 5.
Answer:
(x+5)^2=81 would be correct
Step-by-step explanation:
solution (if you want it)
x² + 10x + 25 = 81
x² + 10x - 56 = 0
(x + 14)(x - 4) = 0
x = 4, x = -14
Sn = n/2(a + l); where sn is the sum of n terms, n is the number of terms, a is the first term and l is the last term.
1390 = n/2(3 + 136)
2780 = 139n
n = 2780/139 = 20
2nd term = 3 + 20 = 23
3rd term = 23 + 20 = 43
First three terms = 3, 23, 43
option b.
