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3 years ago

The mod

Mathematics

1 answer:

Anna007 [38]3 years ago

6 0

Answer:

Step-by-step explanation:

base = 784 sq in² 28 in tall pyramid

each side of the square base = √784 also equals 28

using the Pythagorean theorem the length of each side of the pyramid from the base to the point is

(side/2)² + height² =( length of the pyramid face)²

(28/2)² + 28² = 196 + 784 = 980 = (face length)²

face length = √980 = 31.3

area of the pyramid = 4 sides × area of each face + the area of the base

= 4×[(1/2)(base)(face length)] + side²

= 4(1/2)(28)(31.3) + 784

= 2537 sq in² Not in the solution set

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Vivi is 40 floors from the top of her building. If she starts at the bottom and runs up 5 floors every 20 seconds, how far is sh

Murrr4er [49]

Answer:

17 floors

Step-by-step explanation:

1 floor every 4 seconds.

90/4 = 22.5

40 - 22.5 = 17.5

17.5 is 17ish floors, and is the only answer that is close to 17 floors.

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3 years ago

An ice cream shop sells cones at the volume of 94.2 cubic meters they want to double the volume of the cones without changing th

marin [14]

The volume of a cone is $V=\pi r^2\frac{h}3$ where r = radius and h = height. If the cone has a volume of 94.2 cm³ (I assume you didn't mean m³ because that would be ridiculously huge) and a height of 10 cm, we can plug these values into the formula to find the radius. Don't do any rounding.

$94.2 = \pi r^2\frac{10}3 \\ 282.6 = \pi r^2 *10 \\ 28.26 = \pi r^2 \\ 8.99543738355 = r^2 \\ 2.99923946752=r$

Now we know that's going to be the radius of our new cone as well since we're keeping the diameter the same. The volume is going to be double 94.2 which is 188.4. Let's solve for the height.

$188.4 = \pi (2.99923946752)^2\frac{h}3 \\ 188.4 = \pi(8.99543738355)\frac{h}3 \\ 188.4 = 28.26\frac{h}3 \\ 565.2 = 28.26h \\\\ \boxed{h = 20, r\approx 3}$

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3 years ago

Please help I am struggling please

Katen [24]

Answer:

x = 8sqrt3

y=8

Step-by-step explanation:

cos60=y/16

y=16cos60

y=16x1/2

y=8

sin60=x/16

x=16sin60

x=(16sqrt3)/2

x=8sqrt3

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3 years ago

HELP PLEASE!!! Which of the following is not a true statement about solving two-step equations?

tensa zangetsu [6.8K]

C= two step equations require all number to be whole number in order to solve.

Here is an example that disproves that:
.5x + 8= 18
 -8 -8
.5x = 10
.5 .5

x = 20 (.5 is certainly not a whole number but I solved it anyway)

6 0

3 years ago

Read 2 more answers

How did astronomer Yi Xing (A.D. 683-727) contribute to the development of mathematics in china?

SSSSS [86.1K]

Answer:

Yi Xing invented the astronomical clock and introduced some new methods of interpolation in mathematics.

Step-by-step explanation:

Yi Xing was both an astronomer and a mathematician during the era. He invented the astronomical clock which was more accurate than the initial water and Sun's clock in use.

Furthermore, Yi Xing also discovered some new methods of interpolation in mathematics of which the meaning and interpretation became controversial. Interpolation is a method majorly in mathematics that can be used to estimate a value of a function from its discrete values. It involves first order differences and second order differences.

Also, Yi Xing was able to design a calendar in A.D. 727.

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4 years ago