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miss Akunina [59]
3 years ago
9

For the function f(x)=5x^2-7x, what is f(-3)?

Mathematics
1 answer:
Ainat [17]3 years ago
4 0

Answer:

24

Step-by-step explanation:

f(x)=5x^2-7x

substitute x to 3

f(3)=5(3)^2-7(3)

f(3)=5(9)-21

f(3)=45-21

f(3)=24

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Including a 5 percent sales tax, a hotel charges $147 per night. What’s the cost without the tax
Arisa [49]
For one night WITH SALES TAX, it would be $154.35, but without sales tax, it would just be $147.. unless you add tip, you would just multipy the original by the percent of the tip then add that answer to the original price.

Solving Steps:

WITH SALES TAX :
$147 x 5% = 7.35 or $147 x .05 = 7.35
147 + 7.35 = $154.35
5 0
3 years ago
Sam and Bethan share £54 in the ratio 5:4 Work out how much each person gets
Kitty [74]
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HELP PLZZ!!???? Determine the rate at which Zayna drives for 3 hours at a rate of 44 miles per hour. Later, she drives for anoth
ludmilkaskok [199]

Answer:

C. or 54

Step-by-step explanation:

Assuming we are trying to find r then you would get 3*44 because distance=speed*time so distance is for the 3 hour time is 132 miles. To find the reaming distance you do 240-132= 108 so then we know distance/time=speed so 108/2=54 so the speed is 54 mph

7 0
3 years ago
Read 2 more answers
PLEASE GIVE AN EXPLANATION WITH YOUR ANSWER! 6 cm are cut from a 24 cm board. What is the percent decrease in length?
Firlakuza [10]

Answer:

75%

Step-by-step explanation:

24/6=4

1/4=6

4*6=24

24-6=18

3/4 of 24=18

3/4=75%

3 0
3 years ago
What is the discriminant of 3x^2 - 10 = -2?
Tatiana [17]
The formula for the discriminant is b^2-4ac. The formula you wote is in the form of 
ax^2+c=0, so first, you need to bring that -2 to the left. When you do that, you get (the original equation would be ax^2+bx+c but you have no bx.)

3x^2-8

So, since there's no b, it would be
b^2-4ac
0^2-4(3)(-8
-12 x -8
96

7 0
3 years ago
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