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2 years ago

Help meeeee please. ‼️‼️‼️‼️

Mathematics

1 answer:

KatRina [158]2 years ago

8 0

Step-by-step explanation:

look at the picture !

she has to paint actually 6 rectangles :

the 3 tops of the 3 stairs.

and the 3 vertical front boards (the front of each step of the stairs).

what is the area of these rectangles ? summing up all 6 - that is the surface area to be painted.

each top rectangle is clearly

82×19 (19 cm deep) = 1558 cm²

each front board is

82×12 (12 cm high) = 984 cm²

so, in total we have

3×1558 + 3×984 = 4674 + 2952 = 7626 cm²

as surface area to be painted.

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How does the volume of an oblique cylinder change if the radius is reduced to 2/9 of its original size and the height is quadrup

vesna_86 [32]

Volume of a cylinder = π r² h

Let us assume the following values:
radius = 9
height = 10

Volume = 3.14 * 9² * 10
= 3.14 * 81 *10
Volume = 2,543.40

Changes:
radius is reduced to 2/9 of its original size = 9 x 2/9 = 2
height is quadrupled = 10 x 4 = 40

Volume = π r² h
= 3.14 * 2² * 40
= 3.14 * 4 * 40
Volume = 502.40

Original volume = 2543.40 V.S. Volume after change = 502.40

The volume of an oblique cylinder decreased when its radius was decreased to 2/9 of its original size and its height is increased 4 times.

4 0

3 years ago

RYAN COMPLETED 1/8 of his test in 2/5 hour.if ryan's rate stayed the same,how much of his test was finished in one hour? help pl

KiRa [710]

Answer:

Step-by-step explanation:

Multiply 1/8 by 2.5

1/8 x 2.5 = 5/16

Ryan will have completed 5/16 of his test at the 1 hour mark.

I'm always happy to help :)

7 0

3 years ago

- 3.512 m = what does that equal

Aleksandr [31]

Answer:

-3.512m

Step-by-step explanation:

−3.512m

=−3.512*m

=−3.512m

8 0

2 years ago

Define Complementary and Supplementary Angles.

Alla [95]

Answer:

Complementary angles: the angles whose sum is 90° are called complementary angles.

Supplementary angles: the angles whose sum is 180° are called supplementary angles.

Step-by-step explanation:

hope it might help....

3 0

2 years ago

Main Idea: To evaluate an exponential growth or decay function, substitute a value for the exponent variable and simplify.

Helen [10]

If there is more to the answer than what I give please ask for more!

With $F(x) = 3^{x}$ we can find $F(4)$ by substituting 4 into the main function.

So it would look like this: $F(4) = 3^{4} = 3*3*3*3 = 81$

Hope this helps!

3 0

2 years ago