Final answer:
The equivalent expression to 10 + 10 + 10 is '30', as it sums up to the same value. Other provided options like 10³ are not equivalent as they equal 1,000. Understanding powers of 10 is crucial for scientific notation.
Step-by-step explanation:
To write an equivalent expression to 10 + 10 + 10, we need to find a mathematical expression that sums up to the same value. The sum of these three tens is 30. So the equivalent expression is simply 30, which is option c). The other expressions listed do not represent the same value. For example, 10³ (option b) is equal to 10 x 10 x 10, which equals 1,000. The expression 10 - 10 - 10 (option d) results in 0, which is not equivalent. When dealing with scientific notation (as shown in the other examples), numbers are written as a product of a number between 1 and 10 and a power of 10, so understanding powers of 10 is essential for proper notation.