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3 years ago

Eduardo solved a division problem by subtracting and keeping track as shown. Identify

Mathematics

1 answer:

Orlov [11]3 years ago

3 0

Answer:

225 ÷ 17

Step-by-step explanation:

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Sabendo que "K" satisfaz a equação {2(k-8) + 3(-k+1) = -4k +11} Os valores reais de x que satisfazem a equação 15x² - kx + 1 = 0

erastova [34]

Answer:

D) 1/5 e 1/3

Step-by-step explanation:

You have the following quadratic equation:

$15x^2-kx+1=0$ (1)

In order to find the values of x that are solution to the equation (1), you first find the solution for k in the following equation:

$2(k-8)+3(-k+1)=-4k+11\\\\2k-16-3k+3=-4k+11\\\\2k-3k+4k=11+16-3\\\\3k=24\\\\k=8$

Next, you replace the previous value of k in the equation (1) and you use the quadratic formula to find the roots:

$15x^2-8x+1=0\\\\x_{1,2}=\frac{-(-8)\pm \sqrt{(-8)^2-4(15)(1)}}{2(15)}\\\\x_{1,2}=\frac{8\pm 2}{30}\\\\x_1=\frac{1}{5}\\\\x_2=\frac{1}{3}$

Then, the roots of the equation (1) are

D) 1/5 e 1/3

5 0

3 years ago

Write an expression for “seven less than three halves of z”<br>

ser-zykov [4K]

Answer:

7- 3/2Z

thank for points and pick me brainliest pls!

6 0

3 years ago

The number of foam fingers sold at the Kennedy Center from 1900 to 2004 can be modeled by S =

Juliette [100K]

Answer:

C) 11703

Step-by-step explanation:

from 1900 to 1976 is 76 years.

substitute 76 for t:

S = 2(76)^2 + 2(76) - 1

S = 2(5776) + 152 - 1

S = 11552 + 151

S = 11703

7 0

3 years ago

A student's course grade is based on one midterm that counts as 20% of his final grade, one class project that counts as 20%

Rus_ich [418]

Answer:

His overall final score is 80.1.

His letter grade is a B.

Step-by-step explanation:

To find his grade, we multiply each grade by it's weight.

Grades and weights:

His midterm score is 64. The midterm counts 20% = 0.2.

His project score is 80. The project score counts 20% = 0.2.

His homework score is 94. The homework score counts 30%.

His final exam score is 77. It counts 30%.

What is his overall final score?

64*0.2 + 80*0.2 + 94*0.3 + 77*0.3 = 80.1

His overall final score is 80.1.

What letter grade did he earn (A, B, C, D, or F)?

At least 80 but less than 90 is a B. He scored 80.1, so his letter grade is a B.

5 0

3 years ago

Y = 7x + 8<br> y = x + 1

Novosadov [1.4K]

Answer:

Point of Interception: (-7/6, -1/6)

Step-by-step explanation:

y = 7x + 8

y = x + 1

Set equations equal to each other:

7x + 8 = x + 1

Subtract x on both sides:

7x + 8 = x + 1

-x -x

6x + 8 = 1

Subtract 8 on both sides:

6x + 8 = 1

-8 -8

6x = -7

Divide by 6:

6x = -7

/6 /6

x = -7/6

Substitute:

y = x + 1

y = -7/6 + 1

y = -1/6

Coordinate: (-7/6,-1/6)

3 0

2 years ago