How do I solve this?

Step-by-step explanation:

The first box can be filled by adding up the two angles:

  m∠L +m∠M = 42° +48° = 90°

You don't really have to go to that trouble, because you already know that the sum of the two acute angles in a right triangle is 90°. (They are complements of each other.)

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Since no side lengths are given, you need to use your calculator to find the sines of these angles, if a numerical value is required. If a literal ratio is required, the mnemonic SOH CAH TOA reminds you that ...

  Sin = Opposite/Hypotenuse

  sin(L) = MN/LM = sin(42°) ≈ 0.66913

  sin(M) = LN/LM = sin(48°) ≈ 0.74314

step-by-step explanation:

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.