3 years ago

The rule for being the nth item in a certain sequence is n(n+1)/2. what is the 4th term in this sequence ?

Mathematics

1 answer:

Lorico [155]3 years ago

7 0

Answer:

a.) 4

Step-by-step explanation:

a.)4

You might be interested in

I need help with this is this circumference or areas will mark you brainly if right

Pani-rosa [81]

The question is cut off, but here are the formulas for area and circumference:

A = pi * r^2
C = 2 * pi * r

6 0

3 years ago

Jon has a $21.61 balance on a gift card that can be used to purchase online music. Each song download costs $1.29. Jon wants to

s2008m [1.1K]

Answer: Jon can purchase 9 songs.

Step-by-step explanation: $21.61 - $10.00 = $11.61

$1.29 · 9 = $11.61

5 0

3 years ago

How to do this , PLEASE HELP

Oksana_A [137]

$\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] x^{123} x_{123} \sqrt[n]{x} \sqrt[n]{x} x_{123} \lim_{n \to \infty} a_n \int\limits^a_b {x} \, dx =1$

7 0

3 years ago

15 is no more than a number t divided by 5

DaniilM [7]

15 < = t/5 ....multiply both sides by 5
15 * 5 < = t
75 < = t

6 0

3 years ago

Read 2 more answers

What is the focus of the parabola?<br><br> y=−14x2−2x−2<br><br> Enter your answer in the boxes.

Sloan [31]

Answer:

Step-by-step explanation:

Given is a parabola

$y=-14x^2-2x-2$

Let us rewrite this in vertex form

$y=-14(x+\frac{1}{14})^2-\frac{27}{14}$

Hence vertex = $(\frac{-1}{14} ,\frac{-27}{14} )$

Axis of symmetry is

$x=-\frac{1}{14}$

a= $\frac{1}{(14)4} =\frac{1}{56}$

Hence focus would lie on the line of symmetry at a distance of a from vertex

So focus = $(-\frac{1}{14} ,-\frac{27}{14} -\frac{1}{56} )\\=(-\frac{1}{14} , -\frac{109}{56} )$

7 0

4 years ago

Read 2 more answers