PLEASE I NEED HELP CAN YOU SOLVE AND GIVE AN EXPLANATION FOR THIS PROBLEM

4. Perry the platypus is swimming in a straight line toward shore and has a speed of 0.50 m/s. After 4.0 s, his speed is 0.8 m/s. What is Perry's average acceleration? ​

Someone answer this asap rn for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?