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2 years ago

5/6=−4/x+2 A. x=−2 4/5 B. x=−4 2/5 C. x=−5 1/5 D. x=−6 4/5

Mathematics

1 answer:

sukhopar [10]2 years ago

5 0

Answer:

D is your answer i think it is

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Marco is 8 years younger than his brother Paolo. If their product of their ages is 105, how old is Marco? plz help

Nina [5.8K]

Answer:

Marco's age is 7 years old

Step-by-step explanation:

Let

x ----> Marco's age

y ----> Paolo's age

we know that

$x=y-8$ ----> $y=x+8$ ----> equation A

$xy=105$ ----> equation B

substitute equation A in equation B

$x(x+8)=105$

$x^2+8x-105=0$

Solve the quadratic equation

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^2+8x-105=0$

$a=1\\b=8\\c=-105$

substitute in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(-105)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{484}} {2}$

$x=\frac{-8(+/-)22} {2}$

$x=\frac{-8(+)22} {2}=7$

$x=\frac{-8(-)22} {2}=-15$

Remember that the solution cannot be a negative number

The solution is x=7

therefore

Marco's age is 7 years old

4 0

3 years ago

Which of the following are ordered pairs for the equation y = 1/8x + 11

Anna11 [10]

Answer:

(0, 11) is a solution.

(8, 12) is a solution.

(16, 13) is a solution

(1, 89/8)

(2, 45/4)

Step-by-step explanation:

y = 1/8x + 11

for this equation....

y = (1/8) x + 11

let x = 0 get

y = 0 + 11 = 11

(0, 11) is a solution.

(8, 12) is a solution.

(16, 13) is a solution

(1, 89/8) because y = 1/8 + 11 = 1/8 + 88/8 = 89/8

(2, 45/4)

3 0

3 years ago

Give the digits in the tenths place and the hundredths place 73.91

azamat

Tenths is 73.9 hundredths is 73.91

3 0

3 years ago

Solve For H ---I> A=1/2(B₁+B₂)h

Alex

Answer:

h = 2A/(B₁+B₂)

Step-by-step explanation:

Given equation

A=1/2(B₁+B₂)h

Solving for h

A=1/2(B₁+B₂)h
2A = (B₁+B₂)h
2A/(B₁+B₂)= h
h = 2A/(B₁+B₂)

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3 years ago

draw a short roller coaster on graph paper, plot ordered pairs on its path, and determine the slope, or rate of change, along th

UNO [17]

Answer: Soliciting help from outside sources is a violation of your school's Honor Code and academic integrity agreement.

Step-by-step explanation:

Do your best and work with your teacher to ensure that you understand the requirements of this project and are prepared to submit great work!

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3 years ago