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3 years ago

Insert a digit to make numbers that are divisible by 15 if it is possible 89…0

Mathematics

1 answer:

CaHeK987 [17]3 years ago

7 0

Answer:

1 or 4 or 7

Step-by-step explanation:

The number is divisible be 15, that means it is divisible as by 5 and as by 3

(5*3=15). The number is divisible by 5 if the last digit is 0 or 5.

In our case the last digit is 0 so the number is divisuble by 5 anyway.

The number is divisible by 3 if the sum of its digits is divisible by 3.

The sum of digits is 8+9 =17 . 17 is not divisible by 3, however 18,21 or 24 are divisible by 3

So instead ... 1 ( to get sum 18), or 4 ( to get sum 21) or 7 (to get sum 24) can be written

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If 3t-7=5t, then 6t =

Natalija [7]

The answer is: " -21 " .
__________________________________________
We are asked to solve for: "6t" ; which is: "6 * t" .
__________________________________________
Given: 3t − 7 = 5t ; Solve for "t" ; then solve for "6t" ;

     3t − 7 = 5t ;   Subtract "3t" from each side of the equation;
____________________________________________
    3t − 7 − 3t = 5t − 3t ;

to get: -7 = 2t ;

Divide EACH side of the equation by "2" ; to isolate "t" on one side of the equation; and to solve for "t" ;

-7/2 = 2t / 2 ;

-3.5 = t ; ↔ t = - 3.5 ;
____________________________________________
Now, solve for "6t" ;

6 t = 6*(-3.5) = - 21 .   The answer is: " -21 " .
____________________________________________

6 0

3 years ago

How to factor -2 out of -6x+10

KIM [24]

Just divide -6x+10 by -2 and take out what's common.

-6x divided by -2 would be 3x.
10 divided by -2 would be -5.

So the answer is -2(3x-5).

$\sf\ Answer: -2(3x-5)$

5 0

3 years ago

Please helppp with this math question <333

Naya [18.7K]

Answer:

The average rate of change of the function $g(x)=x^2+10x+18$ over the interval $-11 \leq x\leq -1$ is -1

Step-by-step explanation:

We are given the function $g(x)=x^2+10x+18$ over the interval $-11 \leq x\leq -1$

We need to find average rate of change.

The formula used to find average rate of change is : $Average \ rate \ of \ change=\frac{g(b)-g(a)}{b-a}$

We have b=-1 and a=-11

Finding g(b) = g(-1)

$g(x)=x^2+10x+18\\Putting \ x=-1\\g(-1)=(-1)^2+10(-1)+18\\g(-1)=1-10+18\\g(-1)=9$

Finding g(a) = g(-11)

$g(x)=x^2+10x+18\\Putting \ x=-11\\g(-11)=(-11)^2+10(-11)+18\\g(-1)=121-110+18\\g(-1)=29$

Finding average rate of change

$Average \ rate \ of \ change=\frac{g(b)-g(a)}{b-a}\\Average \ rate \ of \ change=\frac{9-29}{-1-(-11)}\\Average \ rate \ of \ change=\frac{-10}{-1+11}\\Average \ rate \ of \ change=\frac{-10}{10}\\Average \ rate \ of \ change=-1$

So, the average rate of change of the function $g(x)=x^2+10x+18$ over the interval $-11 \leq x\leq -1$ is -1

5 0

3 years ago

PLEASE HELP!!

I am Lyosha [343]

36 + 18 = 54

(1) 18/54 = 1/3 = 33%

43 + 24 = 67

(2) 24/67 = 36%

I hope these are right

3 0

3 years ago

Read 2 more answers

The difference of two numbers is 2. The sum of the same two numbers is 6. Find the numbers. Write the numbers from least to grea

Nady [450]

Answer:

2 and 4

Step-by-step explanation:

It says it on the correct answer box.

The difference in two numbers is 2.

2 and 4 are two numbers away from each other.

The sum of the same two numbers is 6.

2+4=6

In least to greatest order they would be written 2, 4

8 0

3 years ago