All categories

2 years ago

What number + (−56)=12 How do I do this?

Mathematics

2 answers:

Mars2501 [29]2 years ago

7 0

Answer:

Step-by-step explanation:

x+(-56)=12

exclude "x"

x=56+12

x=68

lyudmila [28]2 years ago

7 0

Answer:

Missing number = 68

Step-by-step explanation:

You can simply set up an equation like so: $x+(-56)=12$ .

Then, proceed to solve by isolating the x by itself.

x+(-56)=12

+56 +56 <--- Do the opposite operation on both sides to cancel the 56.

x=68

A quick pointer: A number plus a negative number is just subtracting so you can just work backwards.

Answer: 68.

You might be interested in

A television costs $610 this week after costing $745 last week. What was

diamong [38]

It was an increase of 15%

5 0

3 years ago

Plz help on #3 ASAP!:)

masya89 [10]

Answer:

Step-by-step explanation:

4 0

3 years ago

Evaluate 3b2 when b= 4 and when b= - 4.<br> When b=4, 3b2

nydimaria [60]

Answer:

Step-by-step explanation:

3 times 4 times 2

3 times 4 is 12

12 times 2 is 24

Hope this helps you

4 0

3 years ago

Read 2 more answers

PLEASE HELPP!! WILL GIVE BRAINLIEST + 25 POINTS!!

enyata [817]

Answer:

x = -9/4

Step-by-step explanation:

−2(x + 1/4) + 1 = 5

Subtract 2 from both sides.

−2(x + 1/4) = 4

Divide both sides by -2.

x + 1/4 = -2

Subtract 1/4 from both sides.

x = -2 1/4

x = -9/4

4 0

3 years ago

You have been asked to design a can shaped like right circular cylinder that can hold a volume of 432π-cm3. What dimensions of t

rosijanka [135]

Answer:

$Height = 12cm$

$Radius = 6cm$

Step-by-step explanation:

Given

Represent volume with v, height with h and radius with r

$V = 432\pi$

Required

Determine the values of h and r that uses the least amount of material

Volume is calculated as:

$V = \pi r^2h\\$

Substitute 432π for V

$432\pi = \pi r^2h$

Divide through by π

$432 = r^2h$

Make h the subject:

$h = \frac{432}{r^2}$

Surface Area (A) of a cylinder is calculated as thus:

$A=2\pi rh+2\pi r^2$

Substitute $\frac{432}{r^2}$ for h in $A=2\pi rh+2\pi r^2$

$A=2\pi r(\frac{432}{r^2})+2\pi r^2$

$A=2\pi (\frac{432}{r})+2\pi r^2$

Factorize:

$A=2\pi (\frac{432}{r} + r^2)$

To minimize, we have to differentiate both sides and set $A' = 0$

$A'=2\pi (-\frac{432}{r^2} + 2r)$

Set $A' = 0$

$0=2\pi (-\frac{432}{r^2} + 2r)$

Divide through by $2\pi$

$0= -\frac{432}{r^2} + 2r$

$\frac{432}{r^2} = 2r$

Cross Multiply

$2r * r^2 = 432$

$2r^3 = 432$

Divide through by 2

$r^3 = 216$

Take cube roots of both sides

$r = \sqrt[3]{216}$

$r = 6$

Recall that:

$h = \frac{432}{r^2}$

$h = \frac{432}{6^2}$

$h = \frac{432}{36}$

$h = 12$

Hence, the dimension that requires the least amount of material is when

$Height = 12cm$

$Radius = 6cm$

3 0

3 years ago