Find the sum. (Add like terms)
1.(2d + 3) + (4d – 6)

2.(5m² - m + 2) + (3m² + 10)

3. (2t² - 6t - 3) + (-9t² + 9t - 5)

4. (4c² - 8c + 7) + (c³ + 11c – 3)

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Bobby bought 1.12 pounds of turkey at a cost of 2.50 per pound. carla bought 1.4 pounds of turkey at a cost of 2.20 per pound. who spent more and by much?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )