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MariettaO [177]
3 years ago
15

If x=9 and y=−3, evaluate the following expression:20−5y+2x

Mathematics
2 answers:
Olegator [25]3 years ago
8 0

Answer:

The answer is 53.

Explanation:

x = 9

y = -3

20 - 5y + 2x \\ 20 - 5( - 3) + 2(9) \\ 20 + 15 + 18 \\ 35 + 18 \\ 53

pentagon [3]3 years ago
4 0

Answer:

53

Step-by-step explanation:

20-5y+2x

20-5(-3)+2(9)

20--15+18

cancel out the negative signs

20+15+18

=53

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Consider the function f(x) = 3.x2 + 7x + 2.<br> what is the value of the discriminat?
Vika [28.1K]

Answer:

The Discriminant is 25

Step-by-step explanation:

For this case, the discriminant will be given by

b ^ 2 - 4 * a * c

Where

b = 7

a = 3

c = 2

substituting

b ^ 2 - 4 * a * c = (7) ^ 2 - 4 * (3) * (2) = 25

Therefore the value of the discriminant is 25.

How many x-intercepts does this function have?

It has two intercepts with the x axis and can be found by equaling the function to zero. That is to say,

3x2 + 7x + 2 = 0

The results will be the interceptions with x.

What are the number of zeros for this function?

The number of zeros for this function is

two real number solutions

Because it is a quadratic function.

3 0
3 years ago
A barbecue restaurant gives 3 napkins for every 5 items ordered. if an order is for 30 items, how many napkins should be given?
Delicious77 [7]

Answer:

18 napkins

Step-by-step explanation:

If the restaurant gives 3 napkins for every 5 items ordered, and there's 30 items... you must divide 30 by 5 which is 6. Then, multiply 6 by 3. Therefore the answer is 18.

30  \div 5 = 6

6 \times 3 = 18

<em>Hope</em><em> </em><em>this</em><em> </em><em>helped</em><em>:</em><em>)</em>

8 0
3 years ago
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Which is the slowest rate? a. 2,983 km in 5 hr
Eddi Din [679]

Answer:

C. 3,094 km in 12 hr

Step-by-step explanation:

we need to find kilometer per 1 hour so

2983/5=596.6 kilometers per hour

5,193/7= 741.857142857 km per hour

3,094/12=257.833333333 km per hour

1,784/3=594.666666667 km per hour

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7 0
3 years ago
Select all expressions less than 5-square root of 135
belka [17]
It should be b im not sure


5 0
3 years ago
17. Let f(x) = 2x2 + 5x + 6 and g(x) = 3x2 + 4x – 10.<br> a Find f(x) + g(x)<br> b. Find f(x) – g(x)
nalin [4]

Step-by-step explanation:

f(x)+g(x)=(2x^2 + 5x +6) + (3x^2 +4x - 10)

Combine like terms

5x^2 + 9x -4

f(x)-g(x)=(2x^2 + 5x +6) - (3x^2 +4x - 10)

Distribute the negative

(2x^2 + 5x +6) + (-3x^2 -4x + 10)

Combine like terms

-x^2 +x +16

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3 years ago
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