Four Fourth-grade classes from an elementary school took a trip to the United States Capitol. There were 25 students in each class. At the capitol, a maximum of 40 students were allowed on a tour at one time. What was the least number of tours needed for all students to take the tour

step-by-step explanation: i dont

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.