Find the value of the expression below for r = 4 and t = 2.
t3 – r + 20 ÷ r
1. 9
2. 72
3. 6
4. 40
To find the value of the expression t^3 - r + 20 ÷ r when r = 4 and t = 2, we substitute the values into the expression:
2^3 - 4 + 20 ÷ 4
= 8 - 4 + 20 ÷ 4
= 8 - 4 + 5
= 4 + 5
= 9
Therefore, the value of the expression is 9.
The correct answer is 1. 9.
To find the value of the expression t3 - r + 20 ÷ r for r = 4 and t = 2, follow these steps:
Step 1: Replace t with 2 and r with 4 in the expression:
2^3 - 4 + 20 ÷ 4
Step 2: Simplify each operation according to the order of operations (PEMDAS) and evaluate the expression:
2^3 = 2 × 2 × 2 = 8
20 ÷ 4 = 5
Now, substitute these values back into the expression:
8 - 4 + 5
Step 3: Perform addition and subtraction operations in the order they appear from left to right:
8 - 4 = 4
4 + 5 = 9
Therefore, the value of the expression t3 - r + 20 ÷ r for r = 4 and t = 2 is 9.
So, the correct answer is option 1: 9.