All categories

3 years ago

3.

Mathematics

2 answers:

zheka24 [161]3 years ago

6 0

Answer:

Step-by-step explanation:

Sn = (n/2)(a1 + a1 + d(n-1)), where S = sum, a1 = first term, n = number of terms, d = common difference

400 = (n/2)(1 + 1 + 2(n - 1))

400 = (n/2)(2 + 2n - 2)

400 = (n/2)(2n

400 = n2

20 = n

Twenty numbers are in the set.

Lesechka [4]3 years ago

3 0

Answer:

Step-by-step explanation:

You might be interested in

Please Help!! Math Question!

Anastasy [175]

Answer: a: 13

b: 5

c: 4

d: 12

area: 184

Step-by-step explanation:

8 0

2 years ago

Mr. Herrera is going to

Mnenie [13.5K]

Answer:

Mr. Herrera will hike 78 miles on 6th day.

Step-by-step explanation:

Given:

Number of miles Mr. Herrera will hike in 9 days = 117 miles

Total Number of days =9 days

Let us first find the number of miles he will hike in 1 day

By Using Unitary method we get,

Number of miles Mr. Herrera will hike in 1 days= $\frac{117} {9}=13\ miles$

We need to find miles hiked in 6th day.

Number of miles Mr. Herrera will hike on 6th day= Number of miles Mr. Herrera will hike in 1 days $\times$ Number of days = $13 \times 6 =78$

7 0

3 years ago

Is a kite a parallelogram?

Elena L [17]

Answer: A kite is generally not considered a parallelogram. A kite is usually defined as having two sets of consecutive congruent sides. If the definition includes the phrase two DISTINCT sets of congruent sides it will not be a parallelogram, as the opposite sides will not be congruent.

Step-by-step explanation:

5 0

3 years ago

A car travels along a hill inclined 12º with the horizontal for a distance of 1200 feet. What is the horizontal distance travele

ANTONII [103]

Answer:

the horizontal distance traveled by the car during this time is 812

Step-by-step explanation:

7 0

2 years ago

Elapsed time in minutes<br> Start time 3:10pm <br> end time 4;00pm

gizmo_the_mogwai [7]

50 minutes has elapsed.

6 0

2 years ago