Does it cost more money to teach math and science? Or are other factors at play? Education budgets may have been cut over the past few years but in real dollars

Does it cost more money to teach math and science? Or are other factors at play? Education budgets may have been cut over the past few years but in real dollars, they are significantly larger than they were in the '50s, '60s, and even the '90s. So is willingness to spend a problem? Or are we spending on the wrong things?