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3 years ago

X(21)+x(4)=300 I need solving

Mathematics

1 answer:

Genrish500 [490]3 years ago

5 0

Answer:

Step-by-step explanation:

21x + 4x = 300 Put brackets around the first two terms.

(21x + 4x) = 300 Pull the x outside the brackets. Use the distributive property. Combine the left

25x = 300 Divide by 25

25x/25=300/25 Do the division

x = 12

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4 x y -7y +9 x y + 12y

yulyashka [42]

Answer:13xy+5y

Step-by-step explanation:

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3 years ago

If a=12 and 120% of a is equal to 80% of b then what is a+b

mojhsa [17]

A=12
120% of a =80% of b
120%a = 80%b
120a/100 = 80b/100
Divide through by 100
120a = 80b
Divide through by 80
120a/80 = b
But a=12
120x 12/80 = b
18 = b
b = 18

a+b = 12 + 18 = 30

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2 years ago

Find the angle θ between u = <7, –2> and v = <–1, 2>.

Dmitry_Shevchenko [17]

The angle between two vectors is:

CosФ = u - v / Magnitude(u) x magnitude(v)

Magnitude of u = SQRT(7^2 + -2^2) = SQRT(49 +4) = SQRT(53)

Magnitude of v = SQRT(-1^2 +2^2) = SQRT(1 +4) = SQRT(5)

u x v = (7 x -1) + (-2 x 2) = -7 + -4 = -11

cosФ = -11 / sqrt(53) x sqrt(5)

cosФ = -11sqrt265) / 265

Ф =cos^-1(-11sqrt265) / 265)

Ф=132.51 degrees.

7 0

3 years ago

Read 2 more answers

Please help!!

vodomira [7]

Answer:

The population will be 240,116

Step-by-step explanation:

Exponential growth can be represented by the expression:

$P(t) = P_i\,(1+r)^t$

where:

$P(t)$ is the population at time (t)

$P_i$ is the initial value of the population

"r" is the annual rate of growth (written in decimal form)

and "t" is the time in years.

Therefore in this situation, P(16) is what we want to find [the population after 16 years]

the initial population $P_i$ is 110,000

the rate of growth is 0.05 [decimal form of 5%]

and t is 16 years.

Replacing all these in the given functional form gives:

$P(t) = P_i\,(1+r)^t\\P(16)=110000\,(1+0.05)^16\\P(16)=240116$

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3 years ago

Solving these quadratics for x using complete the square 3x^2-4x-1=0

ZanzabumX [31]

Answer:

in picture

Step-by-step explanation:

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3 years ago