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wolverine [178]
3 years ago
10

Ariel left her home at 9 a.m., driving at 45 mph. At 11 a.m. her brother left the home and started after her at 60 mph. At what

time did Ariel's brother catch up with Ariel?
Mathematics
1 answer:
Vlada [557]3 years ago
6 0

Answer:

5:00 pm

Step-by-step explanation:

Let

x -----> the umber of hours

y ----> the total distance in miles

we know that

The distance is equal to the speed multiplied by the time

Find out the distance traveled by Ariel at 11:00 am

11:00 am-09:00 am=2 hours

45(2)=90 miles

so

<em>Ariel's linear equation is</em>

y=45x+90 ----> equation A

<em>Ariel's brother linear equation is</em>

y=60x ----> equation B

Equate equation A and equation B

60x=45x+90

Solve for x

60x-45x=90

15x=90

x=6\ hours

Adds 11:00 am + 6 hours=17:00 =5:00 pm

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Elanso [62]

27) if a = 1/a

multiply both sides by a

a * a = 1/a * a

a^ 2 = 1

Answer is D) 1

28)

6 x 75 = 450

7 x 80  = 560

8 x 85 = 680

9 x 90 = 810

Total all students in class = 6 + 7 + 8 + 9 = 30 students

Total score of whole class:

450 + 560 + 680 + 810 = 2500

Average = 2500 /30 = 83.3 = 83 1/3

Answer is C) 83 1/3

8 0
3 years ago
Find the inverse of the rational function f(x)=2x/x+3
SashulF [63]

Answer:

{f(x)}^{ - 1}  =    \frac { - 3x}{x   - 2}

Step-by-step explanation:

check image above

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5 0
3 years ago
Do these ratios form a proportion 6/3 and 9/12
vaieri [72.5K]
6:3 6 to 3, 9:12 9 to 12 i think that’s what you mean
6 0
2 years ago
Read 2 more answers
What are the domain and range of the function f(x) = 2^x+1?
scoundrel [369]

Answer:

Domain: (-∞, ∞)

 Range: (0,∞)

Step-by-step explanation:

Exponential functions are curves which approach a horizontal asymptote usually at y=0 or the x-axis unless a value has been added to it. If it has, the curve shifts. This function has addition on the exponent but not to the whole function so it does not change the asymptote. Its y - values remain between 0 and ∞. This is the range, the set of y values.

However, the range of exponentials can change based on the leading coefficient. If it is negative the graph flips upside down and its range goes to -∞. This doesn't have it either.

The addition to 1 on the exponent shifts the function to the left but doesn't change the range.

In exponential functions, the x values are usually not affected and all are included in the function. Even though it shifts, the domain doesn't change either. Its domain is (-∞, ∞).

Domain: (-∞, ∞)

 Range: (0,∞)

5 0
3 years ago
Anna is paid $15.00 per hour. She works a long 12 hour shift, the last 4 hours being paid a double time pay rate.
balu736 [363]

Answer: \Large\boxed{Wage=\$240}

Step-by-step explanation:

<u>Given information</u>

Paid = $15.00 / hour

Paid (Last 4 hours) = Doubled the usual pay rate

Total hour = 12 hours

<u>Given expression</u>

Wage = Pay rate × hours except for the last 4 hours + Double Pay rate × 4 hours

<u>Substitute values into the expression</u>

Wage = (15) × (12 - 4) + (15 × 2) × (4)

<u />

<u>Simplify values in the parenthesis</u>

Wage = 15 × 8 + 30 × 4

<u>Simplify by multiplication</u>

Wage = 120 + 120

<u>Simplify by addition</u>

\Large\boxed{Wage=\$240}

Hope this helps!! :)

Please let me know if you have any questions

7 0
10 months ago
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