Answer:
Express, bilateral contract
Step-by-step explanation:
An express contract is one in which the terms are explicitly spelt out to both parties. These terms are spelt out in its entirety and its usually in an oral form as opposed to the conventional written form. An express contract can be call a special contract.
A bilateral contract is one in which both parties agree to carry out their side of the contract.
In the above question, Maria and Todd had an oral agreement rather than a written one which signifies an express contract. While also both maria and Todd agreed to shovel the snow and pay $25 respectively and both of them help up their end of the contract.