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Advocard [28]
3 years ago
13

I need sum help with math

Mathematics
1 answer:
Margaret [11]3 years ago
7 0

Answer:

Step-by-step explanation:

1) (1÷5)*5*14 = \frac{1}{5}*5*14 = 1*14 = 14

2) 6 + 4(19 - 5) = 6 + 4 * 14

                         = 6 + 56

                         =  62

Or

Use distributive property. a(b+c) = a*b + a*c

6 + 4( 19 - 5) = 6 + 4* 19 - 4*5

                    = 6 + 76 - 20

                    = 82 - 20

                   = 62

3) 5(14- 5) + 6 (3 +7) = 5 * 9 + 6 *10

                                 = 54 + 60

                                 = 114

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If t = 0 in 1980, find the value for t in 1990
lora16 [44]

The value of t is 6.65

<h3>What is exponential function?</h3>

An exponential function is a mathematical function of the following form: f ( x ) = a^x. where x is a variable, and a is a constant called the base of the function.

Given:

A= 210 million

P= A e^(kt)

225 = 210 * e ^ (0.0069t)

225/210=  e ^ (0.0069t)

1.07 =  e ^ (0.0069t)

Taking log on both side

log  1.047 = 0.0069 t log e

\frac{0.0069t\ln \left(e\right)}{0.0069\ln \left(e\right)}=\frac{\ln \left(1.047\right)}{0.0069\ln \left(e\right)}

t= log ( 1.047) / 0.0069

t= 6.65

Hence, value of t is 6.65.

Learn more about this  exponential function here:

brainly.com/question/12889747

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4 0
2 years ago
A fireman's water hose shoots 320 kg of water each second against the door of a building. The velocity of the water is 20 m/s an
NeX [460]

Answer:

6400\ \text{N}

Step-by-step explanation:

\dfrac{m}{t} = Mass flow rate of water = 320 kg/s

m = Mass of water on the door

t = Time

v = Velocity of water on the door = 20 m/s

Force is given by

F=\dfrac{m}{t}v\\\Rightarrow F=320\times 20\\\Rightarrow F=6400\ \text{N}

The average force is exerted by the stream of water is 6400\ \text{N}.

3 0
3 years ago
5. Skylar has pool toys shaped like a sphere
slega [8]

Answer:

128π or 402.12

Step-by-step explanation:

Vol of a sphere = 4/3πr³

Sub 2 into ^

Multiply by 12 to find vol of all 12 shapes

This is the volume of water needed

6 0
3 years ago
2 MULTIPLE CHOICE EASY!! In July, Ariel recorded the height of a pine tree and how quickly it was expected to grow in the next s
Svetach [21]

Answer:

3

Step-by-step explanation:!!

6 0
3 years ago
Use determinants to find out if the matrix is invertible.
wariber [46]

Answer:

The matrix is not invertible.

Step-by-step explanation:

We are given the following matrix in the question:

A =\left[\begin{array}{ccc}-5&0&1\\-1&3&2\\0&10&6\end{array}\right]

Condition for invertible matrix:

A matrix is invertible if and only if the the determinant is non-zero.

We can find the determinant of the matrix as:

|A| = -5[(3)(6)-(2)(10)]-0[(-1)(6)-(2)(0)] + 1[(-1)(10)-(3)(0)]\\|A| = -5(18-20)+(-10)\\|A| = 10-10\\|A| = 0

Since the determinant of the given matrix is zero, the given matrix is not invertible.

5 0
3 years ago
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