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3 years ago

I need helppppp. please help me please.

Mathematics

2 answers:

lora16 [44]3 years ago

8 0

Answer:

Economic importance

Step-by-step explanation:

mariarad [96]3 years ago

8 0

Answer:

Economic importance

Step-by-step explanation:

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What are the sine and cosine of 4π/3?

nignag [31]

Answer:

See below.

Step-by-step explanation:

Sin (4π/3) = -sqrt(3)/2

Cos(4π/3) = -1/2

5 0

3 years ago

What percentage of 23 is 924

monitta

Well, the answer to the question in your picture is $1200.

If x is the original price, and we took 23%, or 0.23 from that, we are left with 77%, or 0.77 of the full price.

So 0.77x = 924
x = 924/0.77
x = 1,200

1200 - 0.23(1200) = 924

924 = 0.77x

8 0

3 years ago

Read 2 more answers

True or False. The mapping diagram shows a function.

Anna [14]

Answer:

False.

Step-by-step explanation:

6 0

3 years ago

I think i have the right answer but I don’t know how to show my work/explanation, please help! *GRADE 9 WORK*

IrinaK [193]

Answer:

5 boys

Step-by-step explanation:

boys to girls in math class = 3/12

3/12 can be reduced to 1/4

In the science class, the ratio is the same but there is a total of 20 girls.

Multiply the fraction 1/4 by 2/2, 3/3, 4/4, 5/5, etc. until you get x/20. Then you have 20 girls. x is the number of boys.

1/4 = 2/8 = 3/12 = 4/16 = 5/20

In science the ratio of 1/4 is the same as 5/20, so there are 5 boys.

Answer: 5 boys

4 0

4 years ago

The lateral surface area of a cylinder is 1106 cm2. Given that the height is 11 cm, calculate the radius. Answer to the nearest

Gwar [14]

The formula for the surface area of a cylinder with radius r and height h is $2 \pi r^2 + h*2 \pi r$
since h=11, substitute into the formula to get $2 \pi r^2 + 11*2 \pi r=1106$
$2 \pi r^2 + 22 \pi r= 1106$
$\pi r^2 + 11\pi r= 553$
since the total surface area isn't given in pi units, we can set pi=3.14
$3.14r^2 + 11*3.14 r= 553$
$3.14r^2 + 34.54 r= 553$
$3.14r^2 + 34.54 r-553=0$
$314r^2 + 3454 r-55300=0$
$157r^2 + 1727 r-27650=0$
$\boxed{r\approx 9 cm}$

8 0

3 years ago