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2 years ago

Help me with number 15, will give brainliest:)

Mathematics

2 answers:

Anna11 [10]2 years ago

8 0

The correct answer would be D.

gladu [14]2 years ago

5 0

i believe it’s D because where you have 20 marked it’s 20 more from where you are which would be around 40 which is why i’m saying D

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Ali used the expressed 8+25×2-45 to find how many CDs he has. how many CDs dose he have

MatroZZZ [7]

Ali has 13 CD's

Here's how I got my answer:

Step 1: Simplify $25 * 2$ to 50. Which leaves us with $8 + 50 - 45$

Step 2: Simplify $50 - 45$ to 5. Which leaves us with $8 + 5$ .

Step 3: Simplify $8 + 5$ , to get your answer, 13.

7 0

3 years ago

Read 2 more answers

How do you solve this equation?

Travka [436]

Exponentail thingies

easy, look at all them them, see that they have 5 in common?
rremember how esay it was to factor
ax^2+bx+c=0

now we have
5^(2x)-6(5^x)+5=0
remember that 5^(2x)=(5^2)^x or (5^x)^2
in other words, we can rewrite it as
1(5^x)^2-6(5^x)+5=0
if yo want, replace 5^x with a and factor
1a^2-6a+5=0
(a-1)(a-5)=0
a=5^x
(5^x-1)(5^x-5)=0
set each to zero

5^x-1=0
5^x=1
take the log₅ of both sides
x=log₅1

5^x-4=0
5^x=4
take the log₅ of both sides
x=log₅4

x=log₅1 and/or log₅4

second quesiton

same thing

1(2^x)-10(2^x)+16=0
factor
(2^x-8)(2^x-2)=0
set each to zero

2^x-8=9
2^x=8
x=3

2^x-2=0
2^x=2
x=1

x=3 or 1

first one
x=log₅1 and/or log₅4
second one
x=1 and/or 3

7 0

3 years ago

What was developed in 1883 by the railroad companies to standardize the transportation of goods across the nation?

uranmaximum [27]

Answer: standard time

Step-by-step explanation:

4 times zones one hour apart

7 0

3 years ago

Write an equation of the line that passes through the given point and is (a) parallel and (b)

viktelen [127]

Answer:

parallel line: y=-3x+14

perpendicular line: y=1/3x +2/3

Step-by-step explanation:

For the parallel line, use the point-slope formula to find the equation of the parallel line (since the slope is the same as the given line and the point (4,2) is given. For the perpendicular line, use the opposite reciprocal of the slope of the given line and use the point-slope formula again. The point-slope formula is Y-Y1=m(X-X1)

3 0

2 years ago

Find the following list of data calculate a demean be the maid in and see the mouth or mothers of the numbers from

Lelechka [254]

Given:

A fair die is rolled.

It pays off $10 for 6, $7 for a 5, $4 for a 4 and no payoff otherwise.

To find:

The expected winning for this game.

Solution:

If a die is rolled then the possible outcomes are 1, 2, 3, 4, 5, 6.

The probability of getting a 6 is: