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Rainbow [258]
2 years ago
8

Can someone please help me with the 2 questions below. (they go together)

Mathematics
1 answer:
il63 [147K]2 years ago
6 0

Answer:

r=√(A/π)

r=2.8

Step-by-step explanation:

We want to get (r) alone on one side

A=πr^2

divide each side by π

A/π=r^2

square root each side

√(A/π)=r

r=√(A/π) is the answer to your first question.

now we are given A

r=√((25)/3.14)

put the left side into a calculator

r=2.8216632

round to nearest tenth of a centimeter

r=2.8

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Find the real solution(s) of the following equation. P3=125
Irina-Kira [14]

p^3=125\implies p=\sqrt[3]{125}=5.

Hope this helps.

3 0
3 years ago
X^100+1 divide by x+1​
timofeeve [1]

Answer:

x=-1

Step-by-step explanation:

\frac{x ^{100} + 1 }{x + 1}

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7 0
2 years ago
Solve for n<br> n +8,7 = 16,2<br> on=65<br> on=75<br> On=85<br> On = 24.9
Usimov [2.4K]

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There is not enough to solve.

Step-by-step explanation:

7 0
3 years ago
Write an equation in slope intercept form of the line that passes through the point (-5, -1) with slope -3.
Neporo4naja [7]

Answer:

y= -3x-16

Step-by-step explanation:

slope intercept form is written as y=mx+b.  m is the slope, and b is the y-intercept.  -3=m

we know that (-5,-1) is 5 points away from the origin, and that the slope is -3, so 5 times -3 equals -15.  subtract 15 from -1 (y-coordinate) in order to get the y-intercept (when x=0).  

3 0
2 years ago
Hello I don’t understand question 9 a and b. Please show working out.<br> Thanks
brilliants [131]
A) I would make the positive integer x and then form an equation.

x + 30 = x^2 - 12
x + 42 = x^2
0 = x^2 - x - 42 this can be factorised
(x - 7) ( x + 6) Therefore x = 7 or x = -6

Since the question asks for a positive integer the answer is 7.

B) two positive numbers x and y.

X - y = 3
x^2 + y^2 = 117

Use these simultaneous equations to figure out each number.

Rearrange the first equation

x = y + 3

Then substitute it into the second equation.

(y+3)^2 + y^2 = 117
y^2 + 6y + 9 + y^2 = 117
2y^2 + 6y - 108 = 0
then factorise this.
(2y - 12) (y + 9)

This means that y = 6 or y = -9 but it’s 6 because that’s the only positive number.

Use y to find x

x = y + 3
x = 6 + 3
x = 9

So the answers are x = 9 and y = 6.
3 0
3 years ago
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