Answer:
Step-by-step explanation:
For the surface area we need to add up all the areas in the pyramid:
- area of the triangle sides (there are 4 triangles)
Area of the base:
the base is a square, and the area of a square is given by:
where 
is the length of the side: 
, thus:
Area of the triangles:
one triangle has the area given by the formula:
where 
is the base of the triangle: 
and 
is the height of the triangle: 
, thus we have the following:
the expression that represents the surface area of the pyramid is:
substituting our values:
which is option B
distance = rate times time.
Here the distance covered by the first train is (70 km/hr)t (t=# of hours), and that by the second train is (85 km/hr)t.
Add these together and set the sum equal to 620 km:
70t + 85t = 620, or 155t = 620, or 4. It will take 4 hours for the distance between the two trains to increase to 620 km.
Answer:
2
Step-by-step explanation:
We can find the slope using the formula
m = ( y2-y1)/(x2-x1)
= ( 5-1)/( -1 - -3)
= ( 5-1)/( -1+3)
= 4/2
= 2
Answer:
D) 58.5%
Step-by-step explanation:
We can rule out A,B, and C becuase they are absurd answers.
A is wrong because just 1% is 1.41.
B is wrong because of A's explanation
C is wrong because over 100% of a number is greater than the initial number
58.5% just by intuition can be seen as the answer that makes the most sense.
give brainliest please!
hope this helps :)
