Answer: B. $3.15
Step-by-step explanation: Hi! So first things you want to add all the things he bought together and then subtract it from the $20. I’m sorry if this isn’t right.
1) Since we have the slope, and one point we can find that linear equation using this point-slope formula. Plugging them we have:

2) Note that we had to add 1 to both sides, to keep the "y "on the left.
3) Therefore, y=-9x+10 is the answer.
9 is 12% of 75 check it 9* 100 = 900 / 75 = 12
Notify your teacher and make sure you check your answer. Like a lot.
Use the calculator even. Go online ask google.
But I guess I can help you out with this one. If my math is correct it is.
D. $492.75
Answer: 30°
Step-by-step explanation:
1. You know that:
- The length of the ladder is 30 feet.
- The window is located 15 feet above the ground.
2. Then, you can draw a right triangle as the one shown in the figure attached. So, you can calculate the angle asked as following:

Where:
α: the angle of the ladder with the ground.
opposite=15 feet
hypotenuse=30 feet
3. When you substitute values, you obtain:

°