To find the total cost for hiring Smith Landscaping to plant 7 trees, we can break down the charges as follows:
- Initial charge: $75
- Cost per tree planted: $10
- Number of trees: 7
Now, calculate the total cost for planting the trees:
\[ \text{Cost for trees} = \text{Number of trees} \times \text{Cost per tree} = 7 \times 10 = 70 \]
Next, add the initial charge to the total cost of planting the trees:
\[ \text{Total cost} = \text{Initial charge} + \text{Cost for trees} = 75 + 70 = 145 \]
Therefore, the total cost for hiring Smith Landscaping to plant 7 trees is $145.