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3 years ago

The width of a rectangle is 12 less than twice the length, and the area of the rectangle is 270m2.

Mathematics

1 answer:

NikAS [45]3 years ago

8 0

Answer:

Step-by-step explanation:

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What is the value of x, if twice x plus 3 cubed equals 40?

tatuchka [14]

I will give two solutions, one where everything is cubed and one where just the 3 is cubed, because I don't know what you meant.

Just the 3 is cubed solution(Which I think is correct because it has a nicer answer):

Answer:

$13/2$

Step-by-step explanation:

We have that $2x+3^3=40$ .

We can subtract $3^3=27$ from both sides of the equation to get $2x=13$ .

We can then divide by $2$ to get $x=13/2$ .

So, $\boxed{x=13/2}$ and we're done!

Everything is cubed solution:

Answer:

$\sqrt[3]{5}-3/2$

Step-by-step explanation:

We have that $(2x+3)^3=40$ .

We can take the cube root of both sides to get $2x+3=\sqrt[3]{40}$ .

Note that $40=2^3*5$ , so $\sqrt[3]{40}=\sqrt[3]{2^3*5}=2\sqrt[3]{5}$ .

So, we want to solve $2x+3=2\sqrt[3]{5}$ .

We can subtract $3$ from both sides to get $2x=2\sqrt[3]{5}-3$ .

We can then divide both sides by $2$ to get $x=\sqrt[3]{5}-3/2$ .

So, $\boxed{x=\sqrt[3]{5}-3/2}$ and we're done!

6 0

3 years ago

The mark-up for a 75 dollar golf club is 80 dollars. Find the percent of the mark-up.

Sonja [21]

So from 75 to 80 and 75 is 100%

80-75=5
5 is x% of 75
x%=percent markup
5=x% times 75
% means parts out of 100 so
x%=x/100
5=x/100 times 75
5=75x/100
75x/100=75/100 times x
75/100=3/4
5=3/4x
multiply both sides by 4/3
20/3=x
6.6666%
the percent mark up is 6.6666%

4 0

4 years ago

Find the inverse of the matrix (4, 2) (1, 2) if it exists

Leya [2.2K]

It’s b
For sure
I think :/

3 0

3 years ago

If a = -7 and b = -16, what is the value of - a - b? is it -23 -9 23 9

stiv31 [10]

If you meant -a minus -b, then this equation will then be -7 minus -16
-7-(-16)
-7+16
=9

3 0

4 years ago