All categories

3 years ago

How can you tell if a number is devisible by 3?

Mathematics

2 answers:

Sunny_sXe [5.5K]3 years ago

6 0

Answer:

Add all the digits.

If the sum of digits is a multiple of 3, the number is too

AnnyKZ [126]3 years ago

6 0

Answer: Add up the digits of the number and if it is 9 it can be divided by three.

Step-by-step explanation:

It works

You might be interested in

F=5/4(n-90)<br> Find n <br> Helppp

padilas [110]

Answer:

n= 4f/5+90

Step-by-step explanation:

f= 5(n−90) /4 (simplify)

f * 4=5(n−90) (multiply 4 on both sides)

4f=5(n−90) (regroup)

4f/5 =n−90 (divide 5 on both sides)

4f/5 +90=n (add 90 to both sides)

4 0

3 years ago

Solve the equation 15p2 + 7p − 4 = 0 by completing the square.

natulia [17]

Answer:

p=0 or p=-7/15

Step-by-step explanation:

15p2+7p=0

p(15p+7)=0

p=0 or 15p+7=0

4 0

1 year ago

13. A map has a scale of 2 cm to 3 km.

Aleksandr [31]

Scale = 1cm:3km

Therefore area of lake = 81Km

1:3 = x:81

= 27:81

Therefore the area on map is 27cm

Must click thanks and mark brainliest

6 0

2 years ago

Read 2 more answers

A college professor never finishes his lecture before the end of the hour and always finishes his lectures within 2 min after th

Citrus2011 [14]

Answer:

Value of k is $\displaystyle\frac{3}{8}$

Step-by-step explanation:

We are given the following information in the question:

$f(x) = kx^2, 0\leq x \leq 2\\~~~~~~~= 0, \text{ otherwise}$

where x is the time elapses between the end of the hour and the end of the lecture.

We have to find the values of k.

Since, f(x) is the pdf, then,

$\displaystyle\int^\infty_{-\infty} f(x) = 1\\\\\displaystyle\int^2_{0} f(x) = 1\\\\\displaystyle\int^2_{0} kx^2 = 1\\\\k\bigg[\frac{x^3}{3}\bigg]^2_0 = 1\\\\k\times \frac{8}{3} = 1\\\\k = \frac{3}{8}$

Hence, value of k is $\displaystyle\frac{3}{8}$

4 0

2 years ago

Someone check my answers please

Anna007 [38]

Answer:

its right

Step-by-step explanation:

4 0

2 years ago