Again, may I give my assurances that the above two requests for equipment acquisition would be money well spent for our company.

assurances 是名词 assurance 的复数形式。assurance 来自动词 assure（保证、确保），加上名词后缀 -ance 构成，表示"保证、承诺"的意思。在这里指对设备采购投资回报的正式保证。