3. Classify the triangle with the given side lengths as acute, right, obtuse, 10 points or not a triangle: 11, 13, 25
Not a triangle
Acute
Right
Obtuse
4. Classify the triangle with the given side lengths as acute, right, obtuse, 10 points
or not a triangle. 21, 28, 35
Not a triangle
Acute
Right
Obtuse

3) Obtuse

4) Right

Step-by-step explanation:

3)

11 + 13 > 25 It is a triangle

11² + 13² = 25²

121 + 169 = 625

290 ≠ 625

Since hypotenuse is larger, the triangle is obtuse

4)

21 + 28 > 35 It is a triangle

21² + 28² = 35²

441 + 784 = 1225

1225 = 1225

Since the hypotenuse is equal to the legs, it's a Right triangle

12 pack of pens for $1.09

m packs =  1.09*m = 1.09m

1 composition book = $2.79

n composition books = 2.79*n = 2.79n

Total cost = (1.09m + 2.79n)

Since there is a discount of 5%, the net price would be: 100% - 5% = 95%

Net Cost = 0.95*(1.09m + 2.79n)

Cindy's bill =    $ 0.95*(1.09m + 2.79n)