Can someone explain this I'm so confused

1. 15 : 5 + 1/2 · (-4/7)

2. - 7/10 + (-5/12) - (1/4)

You decide to start saving up to buy your first home. You find an account that pays 8% interest compounded monthly. If you plan on purchasing your home in ten years, how much must you put into the account to have $50,000 for a down payment?

A video game enthusiast saved $750 to spend on a video game player and games. The player costs $400. The games cost $49 each. At most, how many games can the enthusiast buy along with the player?

Do the equation 5y-2x=18 and 6x=-4y-10 form a system of linear equations?

The absolute value of a negative number is 2.78 what is the distance on the number line between the number and it's absolute value

The ratio of peanut butter to cookie dough in a mixture is 1:5. Which of the following best describes the amount of peanut butter and cookie dough in the mixture?

Adam has 16.45 kg of flour, and he uses 6.4 kg to make hot cross buns. The remaining flour is exactly enough to make 15 batches of scones. How much flour, on kg, will be in each batch of scomes?

Rebecca has 30 paintings to sell. the amount of money rebecca makes from selling x paintings is represented by a function.

What's the exponent of x in 4x?

What is the scientific notation for number of kilometers light will travel in 60 seconds?

70 p x 2 1/2 = how many pounds