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laila [671]
3 years ago
6

Is b = 15 a solution to the equation 4b - 20 = 40?

Mathematics
2 answers:
irina [24]3 years ago
5 0

Answer:

yes

Step-by-step explanation:

4 x 15 - 20 = 40

60 - 20 = 40

fenix001 [56]3 years ago
5 0
Answer: yes

Explanation: 4(15) - 20 = 40
60 - 20 = 40
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The circumference of a circle is 3.14 inches.<br> What is the area of the circle?
SVETLANKA909090 [29]

Answer:

A = .785 inches ^2

Step-by-step explanation:

C = pi *d

We know the diameter = 2*r

C = pi*2*r

Substituting pi = 3.14 we can solve for r

3.14 = 2*pi*r

3.14 = 2*3.14 *r

Divide by 3.14 on each side

3.14/3.14 = 2*3.14 *r/3.14

1 = 2r

Divide by 2

1/2 =2r/2

1/2 =r

Now we can find the area

A = pi *r^2

A = 3.14 *(1/2)^2

A= 3.14 *1/4

A = .785 inches ^2

6 0
3 years ago
Find the equation of all tangent lines having slope of -1 that are tangent to the curve y=(9)/(x+1)
fredd [130]

Answer:

f(x)=\frac9{x+1}\\ f'(x)=-\frac9{(x+1)^2}\\ f'(x)=-1\ \iff\ -\frac9{(x+1)^2}=-1\ \to \ \frac9{(x+1)^2}=1\ \to \ (x+1)^2=9\\ |x+1|=3\ \to \ x+1=3\ \vee\ x+1=-3\\ x_1=2\ \vee\ x_2=-4\\ f(x_1)=f(2)=\frac9{2+1}=3\\ f(x_2)=f(-4)=\frac9{-4+1}=-3

First tangent line:

y=f'(x_1)\cdot (x-x_1)+f(x_1)\ \to \ y=-1(x-2)+3\ \to \ y=-x+5

Second tangent line:

y=f'(x_2)\cdot (x-x_2)+f(x_2)\ \to \ y=-1(x+4)-3\ \to \ y=-x-7


Notice: slope of -1 means that both f'(x_1), \ f'(x_2) are equal to -1, so f'(x_1)=-1 \ and \ f'(x_2)=-1


6 0
3 years ago
Read 2 more answers
From 24 teachers to 30 teachers Find each percent increase. Round to the nearest percent
yulyashka [42]
% = (Change/Original) * 100
= (6/24) * 100
= (0.25) * 100
= 25%
5 0
3 years ago
Read 2 more answers
2(3²+4²)=? <br><br><br><br><br> WHATS THE ANSWER
yulyashka [42]

Answer:

50

Step-by-step explanation:

P- Parenthesis

E- Exponents

M- Multiplication

D- Division

A- Addition

S- Subtraction

(3²+4²)

3*3= 9     4*4= 16     16+9= 25      2(25)      25*2= 50

Hope this helped! (ノ◕ヮ◕)ノ*:・゚✧

( ゚д゚)つ Bye

7 0
3 years ago
Correct answer gets brainliest.
Vesnalui [34]

TM = 1/2 KT

y+3 = 1/2(5y+3)

y+3 = 2.5y +1.5

y = 2.5y - 1.5

-1.5y = -1.5

y = 1

6 0
3 years ago
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