How many months (t) it will take it double his investment?

Need asap. solve for the following inequality

The dash figure is a dilation if the original figure. find the scale factor. classify the dilation as an enlargement or a reduction

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! )