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2 years ago

Help me match these formulas pleasee:(

1 answer:

6 0

1. $A= \frac{ah_a}{2},P=a+b+c$
2. $A= \frac{r^2\pi\alpha}{360^o}$
3. $l= \frac{r\pi\alpha}{180^o}$
4. $A=ab,P=2(a+b)$
5. $C=2r\pi$
6. $A=r^2\pi$
7. $P=na,S_n=(n-2)180^o,\alpha= \frac{S_n}{n}$
8. $P=3a,A= \frac{a^2\sqrt{3}}{4}$

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In a box of 720 pens,40% of the pens are blue. how many blue pens are there in the box?

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Answer:

blue pens=288

Step-by-step explanation:

blue pens=720×40%

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blue pens=288

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3 years ago

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Rom4ik [11]

Answer:

Step-by-step explanation:

here A(-3,-2)

-3 is x and -2 is y

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2 years ago

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2 years ago

Find the area to the nearest square foot of the shaded region below, consisting of a square with a circle cut out of it. Use 3.1

NeTakaya

Answer:

22 square feet

Step-by-step explanation:

Area of shaded region = Area of square - Area of circle. The diameter of the circle is also the length of the side of the square as the circumference of the circle is on the circumference of the square.

Area of circle = 3.14 × r × r

r = 10 ÷ 2

= 5

Area of circle = 3.14 × 5 × 5

= 78.5

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= 100 - 78.5

= 21.5

= 22 (to the nearest square foot)

I hope this helps :)

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2 years ago

Suppose that the water level of a river is 34 feet and that it is receding at a rate of 0.5 foot per day. Write an equation for

vivado [14]

Answer:

The equation to represent the rate of receding water level is L = 34 $(0.5)^{d}$ .

Step-by-step explanation:

Given as :

The initial level of water in river = 34 feet

The rate of receding water level = 0.5 foot per day

Or, The rate of percentage of receding water level = 50 % per day

Let the level of water after d days = L

Now,

The level of water after d days = initial level of water × ( $(1-\dfrac{\textrm Rate}{100})^{Time}$

I.e L = 34 × ( $(1-\dfrac{\textrm 50}{100})^{d}$

∴ L = 34 × $(0.5)^{d}$

Hence The equation to represent the rate of receding water level is L = 34 $(0.5)^{d}$ . Answer

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3 years ago