Algebraic espression of seven less than a number is fifteen

Why the moon is not visible from earth during the new moon ?

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire

Based on current rates the earths human population is expected to grow how much by 2050