Answer:
Step-by-step explanation:
A math class has 5 girls and 5 boys in the seventh grade, 10 students in total. The probability of choosing one girl from this class is
A math class has 5 girls and 7 boys in the eighth grade, 12 students in total. The probability of choosing one girl from this class is
The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. The probability that the students she selects are both girls is
Answer:
3.728 cm²
90
Step-by-step explanation:
To built the envelope I am using a rectangular piece of material 28 m long and 12 m wide.
Out of this material, I have to cut patches that are 1/12 the length and 2/15 the width of the whole material.
So, the length of the patches is m and the width of the patches is
m.
Therefore, the area of the patches is (1.6 × 2.33) = 3.728 m² each. (Answer)
Now, the area of the rectangular piece of material is (28 × 12) = 336 m²
Hence, ≈ 90 such patches can be made out of the whole material. (Answer)