Answer:
7
Step-by-step explanation: Numerator of first fraction times 4 equals numerator of second fraction. So second denominator divided by 4 is 7.
Answer:
1. zach is 20'
2. zack is 13
Step-by-step explanation:
Answer:
1.7 xy +2yx + 4xy +5 =13xy+5
2.5x^2 y+3xy^2+x^2 y==6x2y+3xy2
Step-by-step explanation:
Answer: 8 feet, D
Step-by-step explanation:
To solve this, use the Pythagorean Theorem. It states:

where A and B are the sides of a triangle and C is the triangle's hypotenuse.
The 17 foot ladder in this situation is your hypotenuse, and you have one side of the triangle: 15.

15 squared = 225
17 squared = 289
solving for b squared, we get 
taking the square root of 64, you get 8 feet, the distance between the house and the base of the ladder.
Answer:
80
Step-by-step explanation:
First recall that:
1 inch=12 feet
The volume of cube-shaped boxes with 12-inch edges is 1 cm³
The volume of a box that is 4
feet tall, 4 feet long, and 5 feet wide is
given by:

We substitute l=4ft, w=5ft and h=4ft
To obtain:

Therefore 80 cube-shaped boxes with 12-inch edges can fit into a box that is 4
feet tall, 4 feet long, and 5 feet wide.