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3 years ago

A bike and helmet worth $320. The bike is 7 times more than helmet. Find the value

Mathematics

2 answers:

Yuliya22 [10]3 years ago

7 0

The Bike costs $45.71

mojhsa [17]3 years ago

3 0

The answer is $2,250 :)

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30 points + brainliest to answer with explanation.

Elan Coil [88]

Answer:

sayin 30 points n you have five points up get out

6 0

3 years ago

Read 2 more answers

A grocery store has an average sales of $8000 per day. The store introduced several advertising campaigns in order to increase s

Ann [662]

Answer:

a) Z= 0.0228

b) based on the critical value, it is a one tailed test

c) Since the p-value is less than the level of significance (α= 0.05) so we reject the null hypothesis.

This implies that the advertising campaign has been effective in increasing sales.

Step-by-step explanation:

The null hypothesis is H₀ : µ = 8000

The alternative hypothesis is H₁ : µ ˃ 8000

Mean (µ) = 8000

Standard deviation (σ) = 1200

n = 64

We will use the Z test to test the hypothesis

Z = (X - µ)/ (σ/√n)

Z = (8300 – 8000)/ (1200/√64)

Z = 300/ (1200/8)

Z = 300/ 150

Z= 2

From the normal distribution table,

2 = 0.4772

Φ(z) = 0.4772

Since Z is positive,

P(x˃a) =0.5 - Φ(z)

= 0.5 – 0.4773

= 0.0228

The required P-value = 0.0228

The P-value of one tail Z test at α= 0.05 level of significance

P-value = p(Z˃2.5)

= 0.0228

Since the p-value is less than the level of significance (α= 0.05) so we reject the null hypothesis.

This implies that the advertising campaign has been effective in increasing sales.

3 0

3 years ago

HURRY I NEED HELP!!!!!

Daniel [21]

Answer:

<h3>hey mate here is ur answer:---------------------------------------------------</h3>

<h3>1) f (x) = x 3 + 2x 2 - 8x first factor of x ------> x( x^2 +2x -8) = 0 -------> x = 0 and x^2 +2x -8 = 0</h3><h3 /><h3>1) f (x) = x 3 + 2x 2 - 8x first factor of x ------> x( x^2 +2x -8) = 0 -------> x = 0 and x^2 +2x -8 = 0 Now, you find b^2 -4ac that in this case will be = 2^2 -4*1*(-8) = 4 + 32 = 36 it means this equation has 2 different real roots and will be (-b ±√b^2 - 4ac) / 2a ------> x = 2 , -4 as result #1 has 3 real roots such as 0,2,-4</h3>

<h3>I hope this helps u </h3><h3>have a nice day ✌</h3>

3 0

3 years ago

A person lost in an office building travels up 3 floors in an

soldier1979 [14.2K]

Answer:

B. +3 - 1 + 5 - 4

Step-by-step explanation:

The plus means going up and the negative means you are going down.

You are going up 3 floors (+3)

You are going down 1 floor ( -1)

You are going up 5 floors (+5)

You are going down 4 floors (-4)

Let me know if this helps!

6 0

3 years ago

Please help explanation need it ?

ahrayia [7]

Answer:

Sin(?)=35/48

?=Sin^-1(35/48)

?=46.82

? ≈ 47

OAmalOHopeO

6 0

3 years ago