3z-4=6z-17 how do solve
2 answers:
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Answer:
The correct answer is Cruz's running speed is 10 miles per hour and his biking speed is 16 miles per hour.
Step-by-step explanation:
Let the speed of Cruz when running is s miles per hour and speed of cruz biking is 1.6s miles per hour.
Cruz ran for 90 minutes and rode is bike for 135 minutes.
Total distance covered by Cruz is × s + 1.6s ×
This distance is given to be 51 miles.
⇒ × s + 1.6s ×
= 51
⇒ 90s + 216s = 3060
⇒ 306s = 3060
⇒ s = 10
Cruz's running speed is 10 miles per hour and his biking speed is 16 miles per hour.
Check the picture below.
so... notice, the base, is a square, thus is called a square pyramid, is a 5x5 square, that gives us an area of 25.
but we know the total surface area is 85 though, so, if we subtract or take away the base's area of 25, 85 - 25 = 60, what's leftover is just the area of the 4 triangular faces.
now, the triangles are all equal, so they go evenly in the area of 60, therefore 60/4 is the area of one of the triangular faces, namely 15.
so, now we know the area of one of the triangles is 15, and we know its base is 5, what's the altitude of it? which incidentally is the slant-height of the pyramid.
so... notice, the base, is a square, thus is called a square pyramid, is a 5x5 square, that gives us an area of 25.
but we know the total surface area is 85 though, so, if we subtract or take away the base's area of 25, 85 - 25 = 60, what's leftover is just the area of the 4 triangular faces.
now, the triangles are all equal, so they go evenly in the area of 60, therefore 60/4 is the area of one of the triangular faces, namely 15.
so, now we know the area of one of the triangles is 15, and we know its base is 5, what's the altitude of it? which incidentally is the slant-height of the pyramid.