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3 years ago

Due very soon! Please help

Mathematics

2 answers:

dangina [55]3 years ago

8 0

Answer:

need points thx

Step-by-step explanation:

lol

RUDIKE [14]3 years ago

6 0

Answer: y=-5/4x+7

Step-by-step explanation: You can see, by looking at the graph, that the slope will be negative, so you can eliminate the options with a positive slope. You can take the first point (0,7) and the second point (4,2) and calculate the slope (the change in y divided by the change in x). 7-2 is five, so that gives us our numerator of the slope. 0-4 is -4, so that gives us our denominator. That gives us a slope of -5/4, so the only answer with that slope is the third option, y=-5/4+7. I hope this helps!

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Jake bought the pizza shown above for lunch, which was cut into four equal slices. What percentage of the pizza did Jake eat if

Naddika [18.5K]

He ate 75% because 3/4=75%.

Hope this helped☺☺

5 0

4 years ago

Read 2 more answers

And electrician needs 2 rolls of electrical wire to wire each room in a house how many rooms can he wire with 3/4 of a roll of w

Natasha_Volkova [10]

Answer:

3/8 room

Step-by-step explanation:

Given data

We are told that 2 rolls of wire are needed to wire 1 room

Hence if 1 room needs 2 rolls

x rooms will need 3/4 rolls

cross multiply we have

2x= 3/4

Multiply both sides by 1/2

x= 3/4*1/2

x= 3/8 room

8 0

3 years ago

PLEASE I REALLY NEED HELP 80 POINTS!!!

Thepotemich [5.8K]

Answer:

yes

Step-by-step explanation:

why is because she finds the area of each wall by multiplying the floor length by the height of the wall and she finds the area of the window and doors and subtracts it because you dont paint windows and the doors and then she divides that number by the average area a can of paint covers and finds out that she needs 2 cans of paint.

3 0

3 years ago

A researcher wants to see if a kelp extract helps prevent frost damage on tomato plants. One hundred tomato plants in individual

atroni [7]

Complete question is;

A researcher wants to see if a kelp extract helps prevent frost damage on tomato plants. One hundred tomato plants in individual containers are randomly assigned to two different groups. Plants in both groups are treated identically, except that the plants in group 1 are sprayed weekly with a kelp extract, while the plants in group 2 are not. After the first frost, 12 of the 50 plants in group 1 exhibited damage and 18 of the 50 plants in group 2 showed damage. Let p1 be the actual proportion of all tomato plants of this variety that would experience damage under the kelp treatment, and let p2 be the actual proportion of all tomato plants of this variety that would experience damage under the no-kelp treatment. Is there evidence of a decrease in the proportion of

tomatoes suffering frost damage for tomatoes sprayed with kelp extract? To determine

this, yo u test the hypotheses H0: p1 = p2, Ha: p1 < p2. The p - value of your test is

A) greater than 0.10.

B) between 0.05 and 0.10.

C) between 0.01 and 0.05.

D)between 0.001 and 0.01.

E) below 0.001.

Answer:

B) between 0.05 and 0.10.

Step-by-step explanation:

We are given;

Number of plants in group that exhibited damage = 12

Number of group 1 plants; n₁ = 50

Number of plants in group 2 that exhibited damage = 18

Number of group 2 plants; n₂ = 50

Proportion of plants in group 1 that exhibited damage; p₁^ = 12/50 = 0.24

Proportion of plants in group 2 that exhibited damage; p₂^ = 18/50 = 0.36

Pooled proportion; p¯ = (12 + 18)/(50 + 50) = 0.3

q¯ = 1 - p¯

q¯ = 1 - 0.3 = 0.7

Z-score will be;

z = ((p₁^ - p₂^) - 0)/√((p¯•q¯)×((1/n₁) + (1/n₂))

Plugging in the relevant values;

z = (0.24 - 0.36)/√((0.3 × 0.7) × ((1/50) + (1/50))

z = -0.12/0.092

z = -1.3

From z-distribution table attached, we have;

p-value = 0.0968

Correct answer is option B.

8 0

3 years ago

1. Determine whether the function f(x)= x³ from i to i is one to one. Explain.

Solnce55 [7]

Answer:

The function $f:\mathbb Z\to\mathbb Z,~f(x)=3x+4$ is injective (one-to-one).

Step-by-step explanation:

The definition of an injective function follows.

Let $X,Y$ be sets. Let $f:X\to Y$ be a function. We say $f$ is injective if, for all $x,y\in X$ , $f(x)=f(y)$ implies $x=y$ .

This is the proof that $f:\mathbb Z\to\mathbb Z,~f(x)=3x+4$ is injective.

Let $x,y\in\mathbb Z$ and assume $f(x)=f(y)$ . This means $3x+4=3y+4$ . Subtracting $4$ gives $3x=3y$ , then dividing by $3$ gives $x=y$ . Thus $f$ is injective.

7 0

3 years ago