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worty [1.4K]
2 years ago
6

Need help! BIG OFFER FOR POINTS!

Mathematics
1 answer:
Ksenya-84 [330]2 years ago
3 0
Which one ? All of them?
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Given the function ƒ(x) = 20x2 − 18x − 25, find ƒ(−1).
dlinn [17]

f(x) = 20x² - 18x - 25

f(-1) = 20(-1)² - 18(-1) - 25

= 20 + 18 - 25

= 13

7 0
3 years ago
What are the solutions to the system of equations?
bogdanovich [222]

Answer:

(0, - 3 ) and (- 1, - 5 )

Step-by-step explanation:

Given the 2 equations

y = 4x² + 6x - 3 → (1)

y = 2x - 3 → (2)

Substitute y = 4x² + 6x - 3 into (2)

4x² + 6x - 3 = 2x - 3 ( subtract 2x - 3 from both sides )

4x² + 4x = 0 ← factor out 4x from each term

4x(x + 1) = 0

Equate each factor to zero and solve for x

4x = 0 ⇒ x = 0

x + 1 = 0 ⇒ x = - 1

Substitute these values into (2) for corresponding values of y

x = 0 : y = 2(0) - 3 = 0 - 3 = - 3 ⇒ (0, - 3 )

x = - 1 : y = 2(- 1) - 3 = - 2 - 3 = - 5 ⇒ (- 1, - 5 )

5 0
2 years ago
A bag has 2 blue marbles and 16 red marbles. half of the red marbles are made of plastic. a marble is selected a random from the
bija089 [108]

there are 2 blue marbles, 8 red marbles, and 8 plastic red marbles

there are 18 marbles in total

8/18

6 0
2 years ago
Read 2 more answers
Y varies with square or x. x=3 y=16 find the equation of variation
Vladimir [108]
Y=16x²/9 ....................................
7 0
3 years ago
There were 45 runners to start a race. In the first half of the race, 1/3 of them dropped out. In the second half of the race, 3
Helen [10]
45/3=15 45-15=30 30/5=6 3x6=18 30-18=12 the answer is 12
5 0
2 years ago
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