Question 18: please help. I will give brainliest to correct answer.

Mathematics

2 answers:

Veronika [31]4 years ago

7 0

Answer:

3. mean of 2nd is larger

Step-by-step explanation:

mean of 2nd sem 87 > 86.8 1st sem

Nat2105 [25]4 years ago

6 0

Answer:

Step-by-step explanation:

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Carter can finish painting a fence in 10 hours. When Carter and Chase work together, they can finish painting the fence in about

belka [17]

You have to find the mean (average) which is (10+x)divided by 2 to get how long it would take them together. (chase is x because you don’t know how long yet so u use a variable)

6 0

3 years ago

1. Find the zeros of the function.

Mama L [17]

1. f(x) = 9x² + 6x - 8
f(x) = (3x - 2)(3x + 4)
When (3x - 2) = 0, then x = 2/3
When (3x + 4) = 0, then x = -4/3

Answer: The zeros are two divided by three and negative four divided by three.

2. f(x) = 9x³ - 45x² + 36x
f(x) = 9x(x² - 5x + 4)
= 9x(x - 1)(x - 4)
When 9x = 0, then x = 0
When (x-1) = 0, then x = 1
When (x-4) = 0, then x = 4

Answer: 0, 1 and 4

3. f(x) = 4(x+7)²(x-7)³
When (x+7)² = 0, then x = -7 (twice)
When (x-7)³ = 0, then x = 7 (thrice)

Answer: 7, multiplicity 2; -7 multiplicity 3

4. The zeros of f(x) are √5, -√5, -7
The factors of f(x) are (x-√5)(x+√5)(x+7)
Note that (x-√5)(x+√5) = x² - (√5)² = x² - 5
f(x) = (x²-5)(x+7)
= x³ + 7x² - 5x - 35

Answer: f(x) = x³ + 7x² - 5x - 35

5. Expand (2x + 4)³
From Pascal's Triangle, the coefficients are 1 3 3 1
Therefore
(2x + 4)³ = 1(2x)³(4)⁰ + 3(2x)²(4)¹ + 3(2x)¹(4)² + 1(2x)⁰(4)³
= 8x³ + 48x² + 96x + 64

Answer: 8x³ + 48x² + 96x + 64

3 0

3 years ago

Chef Willie can make 54 pies in 2 hours. At this rate, how many pies can he make in 1 hour?

mihalych1998 [28]

27 pies in one hour 54=2 hours 54 divided by 2 equals 27

4 0

3 years ago

Hello can some one help with with a question?

marin [14]

Answer:

first you'I study and just a question from this app

3 0

3 years ago

On a cold day, hailstones fall with a velocity of 2i − 6k m s−1 . If a cyclist travels through the hail at 10i m s−1 , what is t

Paraphin [41]

Answer:

The velocity of the hail relative to the cyclist is $V_{hc}=-8\hat{i}-6\hat{k}$

The angle at which hailstones falling relative to the cyclist is $\theta = 36.86^\circ$

Step-by-step explanation:

Given : On a cold day, hailstones fall with a velocity of $2\hat{i}-6\hat{k}\text{ m/s}$ . If a cyclist travels through the hail at $10\hat{i} \text{ m/s}$ .