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3 years ago

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Mathematics

2 answers:

leva [86]3 years ago

8 0

Answer:

Thanks!

Step-by-step explanation:

I needed some points.

Arturiano [62]3 years ago

4 0

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Find the value of 1×4+2×5+3×6......n×（n+3）

Arada [10]

Answer:

n(n+1)(n+5)/3

Step-by-step explanation:

there is no value, as we don't know n.

but we can create a summary formula/ function definition :

this is the sum for k = 1 to n of k×(k+3)

k×(k+3) = k² + 3k

so, the overall sum splits into the sum of k² for k=1 to n, and the sum of 3k for k=1 to n.

and the sum of 3k is 3 times the sum of k for k=1 to n.

Σk² for k=1 to n = [n(n+1)(2n+1)]/6

Σk for k=1 to n = n(n+1)/2

3×Σk for k=1 to n = 3×n(n+1)/2

so, we have a function formula

n(n+1)(2n+1)/6 + 3n(n+1)/2 = n(n+1)(2n+1)/6 + 9n(n+1)/6 =

= n(n+1)(2n+1+9)/6 = n(n+1)(2n+10)/6 = n(n+1)(n+5)/3

3 0

3 years ago

Ali Yahoo had $24 to spend on se ven pencils. After buying them she had $10. How much did each pencil cost?

dsp73

$2 each
..............

3 0

3 years ago

Read 2 more answers

PLEASE SOMEONE HELP ME ON THIS PLZ SHOW WORK

ale4655 [162]

This equation is known as the equation for exponential growth/decay:
$y = ab^x$

Since the car is worth no more than $1,900 when bought, we can rewrite the above equation as:
$1900 \geq ab^x$

a is the initial value, and b is the growth factor, x is the amount of time that passes.

So, we can plug in all that information (it's negative because the car's value goes down):
$1900 \geq -17930(0.19)^x$

That's your final answer^.

3 0

3 years ago

If the length of FH is 18 units, what is the value if x

Lyrx [107]

Answer:

The value of x is 3

Step-by-step explanation:

Given that the length of FH is 18 units

we have to find the value of x.

Point G lies between F and H in which measurements are

$\text{FG=4x and GH=2x}$