Answer:
- 494
Step-by-step explanation:
Breaking down the summation into it;s component parts
= 4k - k(k + 1) ← substitute k = 19
= (4 × 19 ) - 1.5 × (19 × 20)
= 76 - (1.5 × 380)
= 76 - 570
= 494
Answer:
Step-by-step explanation:
5.2g +8=0
5.2g=-8
g=-1.54
Answer:
-5
Step-by-step explanation:
When you subtract a negative you end up adding it instead
Answer:
2x+39
Step-by-step explanation: