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3 years ago

"The product of 5 and r, and then increased by k."

Mathematics

2 answers:

Dmitry [639]3 years ago

7 0

5r - k

You don't put the asterisk in between the 5 and the r.

KIM [24]3 years ago

6 0

Answer:

Step-by-step explanation:

5*r+k

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5. 3x + 5y + 5z =1<br> x - 2y = 5<br> 2x + 4y = 11

lilavasa [31]

Answer:

see explanation

Step-by-step explanation:

Given the 3 equations

3x + 5y + 5z = 1 → (1)

x - 2y = 5 → (2)

2x + 4y = 11 → (3)

Use (2) and (3) to solve for x and y

Multiply (2) by 2

2x - 4y = 10 → (4)

Add (3) and (4) term by term

4x = 21 ( divide both sides by 4 )

x = $\frac{21}{4\\}$

Substitute this value of x into (3)

2 × $\frac{21}{4\\}$ + 4y = 11

$\frac{21}{2\\}$ + 4y = 11 ( subtract $\frac{21}{2\\}$ from both sides )

4y = $\frac{1}{2}$ ( divide both sides by 4 )

y = $\frac{1}{8\\}$

Substitute the values of x and y into (1) and solve for z

3 × $\frac{21}{4\\}$ + 5 × $\frac{1}{8\\}$ + 5z = 1

$\frac{63}{4}$ + $\frac{5}{8}$ + 5z = 1

$\frac{131}{8}$ + 5z = 1 ( subtract $\frac{131}{8}$ from both sides )

5z = - $\frac{123}{8}$ ( divide both sides by 5 )

z = - $\frac{123}{40}$

Solution is

x = $\frac{21}{4\\}$ , y = $\frac{1}{8\\}$ , z = - $\frac{123}{40}$

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3 years ago

Find the value of n such that x^2-19x n is a perfect square trinomial.

Marianna [84]

B. 361/4
you get: x^2-19x+361/4=(x-19/2)^2

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4 years ago

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2/5 times 2/3 (28 points)

Alik [6]

Answer:

4/15

Step-by-step explanation:

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Find the six arithmetic means between 1 and 29.

sp2606 [1]

1, ___, ____, _____, _____, _____, ____, 29

29-1 = 28
28/7 = 4
1, 5, 9, 13, 17, 21, 25, 29

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muminat

Answer:

1.70$

Step-by-step explanation:

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