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3 years ago

EMERGENCY OOF HELP WITH MATH PIZZZ 5 + x^2= 2x^2+ 13 Provide steps and thanks

Mathematics

1 answer:

galben [10]3 years ago

4 0

Answer:

false statement

Step-by-step explanation:

5+x^2=2x^2+13

5+x^2-2x-13=0

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

-8-x^2=0

-x^2=8

x^2=-8

this statement is false for any value of x because the power function with an even exponent is always postive or 0

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What is the domain of validity for csc theta = 1 / sin theta?

Rashid [163]

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4 years ago

Solve the following equation, and check your solution. Be sure to show all work

fgiga [73]

24 - 3x = -27

therefore -3x = -27-24

-3x = -51
-x= -17
therefore x is 17

7 0

4 years ago

HELP. there are 45 coins consisting of nickels, dimes and quarter making a total of 7 dollars. the number of dimes exceeds the n

MA_775_DIABLO [31]

9514 1404 393

Answer:

Step-by-step explanation:

Let n, d, q represent the numbers of nickels, dimes, and quarters, respectively. Then we have ...

n + d + q = 45

5n +10d +25q = 700

n -d = -5

Using n=d -5, we can substitute into the first two equations:

(d -5) +d + q = 45

2d +q = 50 . . . . add 5, collect terms [eq4]

5(d -5) +10d +25q = 700

15d +25q = 725 . . . . . . . . . . add 25, collect terms [eq5]

Multiplying [eq4] equation by 3 and subtracting that from 2/5 of [eq5], we have ...

(2/5)(15d +25q) -3(2d +q) = (2/5)(725) -3(50)

6d +10q -6d -3q = 290 -150

7q = 140 . . . . . . simplify

q = 20 . . . . . . . . divide by 7

There are 20 quarters.

8 0

3 years ago

It took me 3 hours to visit my friend in Maine, averaging a speed of 58 miles per hour. If it took me 15 minutes less to get bac

mariarad [96]

Answer:

<u>The average speed coming home was 63.27 miles per hour</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Speed from home to Maine = 58 miles per hour

Time of the first leg of the trip = 3 hours or 180 minutes

Time of the second leg of the trip = 15 minutes less = 180 - 15 = 165 minutes or 2 hours 45 minutes

2. What was my average speed coming home?

Let's calculate the distance from home to Maine, this way:

Speed = Distance/Time

Distance = Speed * Time

Distance = 58 * 3 = 174 miles

Now, let's calculate the speed of the second leg, as follows:

Speed = Distance/Time

2 hours 45 minutes = 2.75

Speed = 174/2.75

<u>Speed = 63.27 miles per hour</u>

8 0

3 years ago

Can someone help me thanks!

ollegr [7]

Answer:

Step-by-step explanation:

- choose any 2 sets of corresponding values and use the formula

( y2 - y1 ) / ( x2 - x1 )

you'll get -3/4

7 0

3 years ago