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3 years ago

Why do you add a zero when multiplying two digits by two digits

1 answer:

6 0

When you add a zero to the problem, it shows you are now multiplying in the double-digits. Let's say you are multiplying 12x12. First you cover up the one then multiply them. Then cover up the two and you have 10. When you multiply them, it ends in a zero. Don't think of it as adding a zero but adding to products.

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The surface area of a sphere is 275.56 1 cm? What is the approximate volume of the sphere?

skad [1K]

Answer:

$V=430.19\ cm^3$ or $V=136.93\pi\ cm^3$

Step-by-step explanation:

The surface area of a sphere is:

$A_s=4\pi r^2$

Where r is the radius of the sphere

In this case we know that $A_s = 275.561\ cm^2$

$4\pi r^2=275.561$

We solve the equation for r

$4\pi r^2=275.561\\r^2 = \frac{275.561}{4\pi}\\\\r=\sqrt{ \frac{275.561}{4\pi}}\\\\r=4.683\ cm$

Now we know the radius of the sphere.

The volume of a sphere is:

$V=\frac{4}{3}\pi r^3$

We substitute the value of the radius in the formula

$V=\frac{4}{3}\pi (4.683)^3$

$V=430.19\ cm^3$

5 0

4 years ago

What is 2y^4 x 5y^3 ??

steposvetlana [31]

10y^7

You multiply the y^4 by y^3
2y^7 x 5
Multiple the 5 by 2

Answer: 10y^7

6 0

4 years ago

Today's temperature is supposed to be 5°C warmer than yesterday. If yesterday's temperature was -10°C, what is today's temperatu

alexandr402 [8]

I believe it would be -5c

7 0

3 years ago

What set of reflections and rotations would carry rectangle abc do onto itself

Tema [17]

The correct answer for this question is "<span>reflect over the y-axis, reflect over the x-axis, rotate 180°." In order to get to the expected transformation, first, flip it over the y-axis which cost 90 degrees of rotation. Then lastly, flip shape from 2nd quadrant over the y-axis. It will now be coincide with the transformation at the 3rd quadrant. Could I be brainlest... I'm a middle schooler who did this so...</span>

3 0

3 years ago

[Function Composition] could someone help me with this answers or show work either is fine

zavuch27 [327]

Answer:

Step-by-step explanation:

Given the following expressions

f(x) = x³-2x

g(x) =-x-2

We are to find (fog)(-5)

fog = f(g(x))

f(g(x)) = f(-x-2)

Replace x with -x-2 in f(x)

f(-x-2) = (-x-2)³-2(-x-2)

f(-x-2) = (-x-2)³+2x+4

fog = (-x-2)³+2x+4

Substitute x = -5 into the result

fog(-5) = (-x-2)³+2x+4

fog(-5) = (-(-5)-2)³+2(-5)+4

fog(-5) = (5-2)³-10+4

fog(-5) = 3³-6

fog(-5) = 27-6

fog(-5) = 21

Hence the required result of the composite function is 21

8 0

3 years ago