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3 years ago

what would the phrase "three times the sum of a number and 4" look like as a variable expression? 3(3x 4) 3x 4 3x−4 3(x 4)

Mathematics

2 answers:

rosijanka [135]3 years ago

6 0

It would be
(X + 3) times 3

Gelneren [198K]3 years ago

4 0

Answer:

3 * (x+4)

Step-by-step explanation:

It says three times the sum of a number and 4.

We can express the number we don't know with an x. So the phrase is saying that we have the sum of a number and 4 which is the same as writing:

x+4

Also, it says three times this sum; so we know that the sum is being multiplied by 3:

3 * (x+4)

If we read this it will be the same as the phrase "three times the sum of a number and 4)

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7 0

2 years ago

PLEAASE SOMEONE HELP ME IM SO STUCK finish the table using the equation y= x/2

BigorU [14]

First one is 0 second is 1 third is 2 and fourth is 3 hope it helps

7 0

2 years ago

Use the markings in the image to answer the following questions (drawing not to scale):

olga nikolaevna [1]

Hope this helps!

There are 3 images with full explanation

3 0

2 years ago

The area of a rectangle is 72 cm square. The length of the rectangle is 6 cm longer than the width. What is the width of the rec

miskamm [114]

The correct option will be : B) 6 cm.

Explanation

Suppose, the width of the rectangle is $x$ cm.

As, the length is 6 cm longer than the width, so the length will be: $(x+6) cm.$

Formula for the Area of rectangle is: $(Length)*(Width)$

Given that, the area of a rectangle is 72 cm²

So....

$x(x+6)=72\\ \\ x^2+6x-72=0\\ \\ (x+12)(x-6)=0$

Using zero-product property, we will get...

$x+12=0\\ x= -12$ (Negative value is ignored as width can't be negative)

and

$x-6=0\\ x=6$

So, the width of the rectangle is 6 cm.

6 0

3 years ago

A certain virus is dying off at a rate of 18% per hour. Initially there were

djyliett [7]

Answer:

3 strain would still alive after 48 hours

Step-by-step explanation:

Initial population of virus = 40000 grams

A certain virus is dying off at a rate of 18% per hour.

We are supposed to find how much of the strain would still be alive after 48 hours

Formula : $N(t)=N_0(1-r)^t$

$N_0$ =Initial population

N(t)= Population after t hours

r = rate of decrease = 18% = 0.18

t = time = 48 hours

So,the strain would still be alive after 48 hours= $40000(1-0.18)^{48}=2.91 \sim 3$

Hence 3 strain would still alive after 48 hours

3 0

3 years ago