Use PEMDAS method to execute operations in the following order:
- Parentheses
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
First equation:
12 + (38 - 18)2 = 12 + 20 × 2 = 52
Second equation:
(12)2 - 6(2 - 23) = 24 - 6(-21) = 24 + 126 = 150
Hope this helps.
The measure of the angle R is 
Explanation:
It is given that the lengths of the triangle are PQ = 8 and QR = 3
To find the angle of R using the opposite and adjacent side, we shall use the tangent formula.

where opp = 8 and adj = 3
Thus, substituting these values in the formula, we get,

Multiplying both sides by
, we get,

Dividing, we get,

Rounding off to the nearest tenth, we have,

Thus, the measure of the angle R is 
3 equivalent ratios or 5/2
10 /4
20/8
30/12