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3 years ago

Make v the subject formulae

Mathematics

2 answers:

Monica [59]3 years ago

6 0

1/u = 1/f -1/v
1/v = 1/u + 1/f

Ilia_Sergeevich [38]3 years ago

4 0

Answer:

v = uf/ u - f

Step-by-step explanation:

multiply the original equation by the LCM that is ufv . bring all terms having a v attached to one side while all terms with no v attached are sent to the other side. factories v out and divide both sides by th term in the bracket.

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Need help understanding the formula

ololo11 [35]

For this case we have the following equation:

$H (t) = -16t ^ 2 + vt + s$

Where,

t: time

v: initial speed

s: initial height

Substituting values we have:

$H (t) = -16t ^ 2 + 15t + 4$

By the time the ball hits the ground we have:

$-16t ^ 2 + 15t + 4 = 0$

From here, we clear the value of time:

Using the quadratic equation we have:

$t=\frac{-15+/-\sqrt{15^2-4(-16)(4)}}{2(-16)}$

Doing the calculations we have:

$t1=-0.217\\t2=1.154$

Discarding the negative root, we have that the time is:

$t=1.154$

Answer:

it takes the ball to hit the floor about:

1.15 seconds

6 0

3 years ago

Read 2 more answers

A certain type of digital camera comes in either a 3-megapixel version or a 4 megapixel version. A camera store has received a s

Morgarella [4.7K]

Answer:

a) Hyper-geometric distribution

b1) P(X=2) = 0.424

b2) P(X>2) = 0.152

C1) Mean of X = 1.67

C2) Standard Deviation of X = 0.65

Step-by-step explanation:

b1) P(X = 2) = (5C2 * 7C2)/(12C4) = (10 * 21)/(495) = 210/495

P(X=2) = 0.424

b2) P(X>2) = 1 - P(X≤2) = 1 - [P(X=0) + P(X=1) + P(X=2)]

P(X=0) = (7C4)/(12C4) = 35/495 = 0.071

P(X=1) = (5C1 * 7C3)/(12C4) = (5 * 35)/(495) = 175/495 = 0.354

P(X=2) = 0.424

P(X>2) = 1 - P(X≤2) = 1 - [0.424 + 0.071 + 0.354]

P(X>2) = 0.152

C1) Mean of X = nk/N

k = number of 3-megapixel cameras = 5

n = number of selected cameras = 4

N = Total number of cameras = 12

Mean of X = 5*4/12

Mean of X = 1.67

C2) Standard Deviation of X

Standard deviation of X=(nk/N*(1-k/N)*(N-n)/(N-1))1/2

Standard Deviation of X=(4*(5/20)*(1-5/12)*((12-4)/(12-1))^1/2 =0.65

Standard Deviation of X = 0.65

4 0

3 years ago

Pemdas please help explain too please

saul85 [17]

Parenthesis

Exponent

Multiplication

Division

Addition

Subtraction

(left to right)

4²-(3.1+6.4)+4.5

According to PEMDAS, we will do what is inside the parenthesis.

3.1+6.4 = 9.5

Then we do figure out the exponent.

4² = (4)(4) = 16

Then we do subtraction then addition because PEMDAS also tells us we should do adding and subtracting from left to right. In this expression, subtracting is on the left side so we should do that first.

16-9.5 = 6.5

11 is your answer :)

6 0

3 years ago

Read 2 more answers

Combine like terms to create an equivalent expression 2s+ (-4s) pls help

Sedaia [141]

Answer:

$- 2s$

Step-by-step explanation:

$2s - 4s \\ - 2s$

8 0

3 years ago

Brenda took her dog to the veterinarian for an exam. The doctor told Brenda her dog needed to lose weight. Her dog weighed 55 po

raketka [301]

Answer:

Step-by-step explanation:

Step one;

given

initial weight = 55 pounds

final weight= 45 pounds

Step two:

Required

the % weight decrease

% decrease= initial-final/initial *100

% decrease= 55-45/55 *100

% decrease= 10/55 *100

% decrease= 0.18 *100

% decrease= 18%

4 0

3 years ago