Formulas:
- Sphere: 4/3 · π · r³
- Cone: (π · r² · h) ÷ 3
- Pyramid: (l · w · h) ÷ 3
Hope this helped☺☺
Cost of t-shirt is £6 and hat is £2 respectively.
Step-by-step explanation:
- Step 1: Let the cost of t-shirt be x and the cost of hat be y. Form equations out of the given information.
4x + y = 26 ------- (1)
x + y = 8 ----------- (2)
Subtract (2) from (1)
⇒ 3x = 18
∴ x = 6
6 + y = 8
∴ y = 2
⇒ Cost of t-shirt is £6 and hat is £2
Answer:
The mean is 66.667 ( approx )
Step-by-step explanation:
Let x be the sum of Tony's group and y be the sum of Alice's group,
We know that,
According to the question,
In Tony's group,
Students = 20,
Mean = 60,
In Alice's group,
Students = 10,
Mean = 80,
Thus, the total sum of combined group of 30 students = 1200 + 800 = 2000,
Hence, the mean of the combined group =
The two square roots are 20 and -20