3 years ago

Simplify the expression: 3 (x + 4) - 2x

Mathematics

1 answer:

Greeley [361]3 years ago

4 0

Answer:

x+12

Step-by-step explanation:

You might be interested in

A force of 8 lb is required to hold a spring stretched 8 in. beyond its natural length. How much work W is done in stretching it

-BARSIC- [3]

Answer:

The work done in stretching it from its natural length to 14 in. beyond its natural length is W=8.17 ft-lb.

Step-by-step explanation:

We know that a force of 8 lb is required to hold a spring stretched 8 in. beyond its natural length.

This let us calculate the spring constant k as:

$F=kx\\\\k=F/x=(8 \;lb)/(8\;in)=1\;lb/in$

We know that work is, in an scalar form, the product of force and distance.

The force F is equal to the spring constant multiplied by the distance from the natural length.

Then, as the force changes with the distance from the natural length, we have to calculate integrating:

$W=\int_0^{14}F\,dx=\int_0^{14}kx\,dx\\\\\\W=\dfrac{1}{2}kx^2\left|^{14}_0=\dfrac{1}{2}(1\,lb/in)(14 \,in)^2-\dfrac{1}{2}(1\,lb/in)(0 \,in)^2$

$W=98lb\cdot in-0lb-in\\\\W=98(lb\cdot in)\cdot \dfrac{1 \,ft}{12\,in}=8.17\;lb\cdot ft$

5 0

3 years ago

If its £18.75 per square metre of clear plastic how much will it cost to cover 2x notice boards 1 metre high and 1 metre wide ?

xenn [34]

Just double 18.75 because the total area needed to cover is 2 square meters

3 0

3 years ago

H e l p y ’ a l l p l e a s e

otez555 [7]

Answer:

im assuming that is a parallelogram and that youre solving for x so

2x - 5 = 17

2x = 22

6 0

3 years ago

14+72×1/10+4×1/1000 compared to 21.24

Mariulka [41]

Answer:21.24 is greater than 14+72×1/10+4×1/1000

Step-by-step explanation:

6 0

3 years ago

Cannot has $75.00 to spend on his family christmas gifts. There are 5 people, besides himself, in his family. How much does Cann

AURORKA [14]

He has 15$ to spend on each person !

3 0

3 years ago

Simplify the expression: 3 (x + 4) - 2x​

Simplify the expression: 3 (x + 4) - 2x