The value of 2a + 3b is 13
The options have not been given but three correct alternatives have been presented as the solution.
Answer:
or
or 
Step-by-step explanation:

Applying the rule
to the numerator of the first term and the denominator of the second term,


By changing ÷ to ×, we invert the second term



Can you put the question in English?
Answer:
b
Step-by-step explanation:
Answer:
11.9 mm
Step-by-step explanation:
We can find d by applying the cosine rules.
d² = 21² + 27² - 2(21)(27) cos (25)
d² = 441 + 729 - 1027.75
d² = 142.25
d = √142.25
d = 11.9 mm (nearest tenth)