Answer:

Step-by-step explanation:
-10 (d+1) = -14
-10d -10 = -14
-10d = -14 + 10
-10d = -4
d = 4/10
d= 2/5
Answer: -1
Step-by-step explanation: 4 + (-3) = 1 1 + (-2) = -1
The correct equation is the last one, where secx =hypotenuse ÷ adjacent, secx is the inverse of cosx, and if you recall, cosx=adjacent÷hypotenuse