(b+5)(b-7)
hope it can help u
Answer:
50 cm
Step-by-step explanation:
4/5 = 40/x
cross multiply
4x=200
x=50
Answer:
see explanation
Step-by-step explanation:
Using the trigonometric identity
sin²x + cos²x = 1
Consider the left side
2cos²A - 1 ← replace 1 by sin²A + cos²A
= 2cos²A - ( sin²A + cos²A)
= 2cos²A - sin²A - cos²A
= cos²A - sin²A = right side ⇒ verified
Answer:
Let 
Solution: 
Step-by-step explanation:
See attached for step-by-step
Answer:
9
Step-by-step explanation:
I replaced the missing variable with x and solved the equation from there.