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3 years ago

Help me please for brainliest!

Mathematics

2 answers:

UkoKoshka [18]3 years ago

7 0

Answer:

1)option b

2)option a

Step-by-step explanation:

1) circumference = 62.8 in

=> 2πr= 62.8

=> r= 62.8/(2×3.14)= 10 in

diameter = 2×10 in = 20 in

2)diameter = 14m

radius = 7 m

Area of the circle= πr² =3.14(7)²=3.14×49

= 153.86

=153.9 m²

kirill115 [55]3 years ago

3 0

Answer:

Q1) B

Q2) A

Step-by-step explanation:

Q1) The equation for working out the circumference of a circle is 2 × π × r or π × d, but here we are asked to do the reverse so,

π × d = 62.8

d = 62.8 ÷ π

d = 19.9

So the answer to the Q1) is 20 inches

Q2) We have to work out the area of the circle so we utilise the formula

π × r² . We only have the diameter but we can half it to find the radius so

14 ÷ 2 = 7. So 7 is the radius, now we substitute into the formula π × r²

3.14 × 7² = 153.86

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rodikova [14]

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plug in the coordinates and get 1-6/5-(-2) which makes our slope -5/7

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7 0

3 years ago

Please help! A - $1,550 B -$20,000 C -$2,000 D -$15,500

MrRa [10]

Answer:

the answer of your question is B

4 0

2 years ago

Need help please help me if you know it

scoundrel [369]

Answer:

I believe it's C... Not sure though...

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2 years ago

A jogger goes 1.5km west and then turns south.If the jogger finishes 1.7 km from the starting point,how far south did the jogger

kakasveta [241]

Hello!

You can use the Pythagorean Theorem to solve this

$a^{2} + b^{2} = c^{2}$

c is the hypotenuse
a and b are the legs

Put in the values you know

$1.5^{2} + b^{2} = 1.7^{2}$

Square the numbers

$2.25+ b^{2} =2.89$

Subtract 2.25 from both sides

$b^{2} =0.64$

Take the square root of both sides

b = 0.8

The answer is 0.8km

Hope this helps!

6 0

2 years ago

Suppose you received a job offer with a starting salary of $48,500 per year and a guaranteed raise of $1200 per year. Find the n

LuckyWell [14K]

Answer:

7 years

Step-by-step explanation:

This is going to be an arithmetic progression:

48500, 48500 + 1200, 48500 + 1200*2, ...

So the first term is

a₁ = 48500

and the common difference is

d = 1200

Sum of AP is:

S = (a₁ + aₙ)*n/2 = (2a₁ + (n - 1)d)*n/2

Substitute and solve for n:

(2*48500 + (n - 1)*1200)*n/2 = 321000
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1200n² + 95800n - 642000 = 0
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Solving we get a positive root of:

n ≈ 6.21 and it rounds up to 7 years

3 0

2 years ago