Answer:

**Answer:**

She washed 21 cars

**Step-by-step explanation:**

Answer:

**Answer:**

Jan washed 21 cars

**Step-by-step explanation:**

**120.75 / (Divided) 5.75=21**

**If you were to times 5.75 by 21 you will get the amount she rasied at the car wash**

Math problems solve

Y+z+ 2; use y=-6, and z = 5

Let X be the set of all 3×3 matrices whose diagonal entries are all 0. With the usual matrix addition and scalar multiplication, is X a vector space? (b) Let Y be the set of all 3 × 3 matrices whose diagonal entries add up to 0. With the usual matrix addition and scalar multiplication, is Y a vector space?

Please help me with this if you know how to do it

PLEASE HELPIf u can’t read it good it says: which equation matches this graph? 1. Y= -4x + 32. Y= 4x + 33. Y= -(1/4) x +34. Y=- (1/4)x + 3

Y+z+ 2; use y=-6, and z = 5

Let X be the set of all 3×3 matrices whose diagonal entries are all 0. With the usual matrix addition and scalar multiplication, is X a vector space? (b) Let Y be the set of all 3 × 3 matrices whose diagonal entries add up to 0. With the usual matrix addition and scalar multiplication, is Y a vector space?

Please help me with this if you know how to do it

PLEASE HELPIf u can’t read it good it says: which equation matches this graph? 1. Y= -4x + 32. Y= 4x + 33. Y= -(1/4) x +34. Y=- (1/4)x + 3

**Answer:**

86.64% probability that the mean tire life of these four tires is between 57,000 and 63,000 miles

**Step-by-step explanation:**

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

**Normal probability distribution:**

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean and standard deviation , the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

**Central limit theorem:**

The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation , the sample means with size n of at least 30 can be approximated to a normal distribution with mean and standard deviation

**In this problem, we have that:**

**Suppose you bought a set of four tires, what is the likelihood the mean tire life of these four tires is between 57,000 and 63,000 miles**

This is the pvalue of Z when X = 63000 subtracted by the pvalue of Z when X = 57000. So

**X = 63000**

By the Central Limit Theorem

has a pvalue of 0.9332

**X = 57000**

has a pvalue of 0.0668

0.9332 - 0.0668 = 0.8664

86.64% probability that the mean tire life of these four tires is between 57,000 and 63,000 miles

**Answer:**

inf(A) does not exist.

**Step-by-step explanation:**

As per the question:

We need to prove that A is closed under multiplication,

If for every

Proof:

Suppose, x, y

Since, both x and y are real numbers thus xy is also a real number.

Now, consider another set B such that:

B = {xy} has only a single element 'xy' and thus [B] is bounded.

Since, [A] represents the union of all the bounded sets, therefore,

⇒ xy

Therefore, from x, y , we have xy .

Hence, set a is closed under multiplication.

Now, to prove whether inf(A) exist or not

Proof:

Let us assume that inf(A) exist and inf(A) =

Thus is also a real number.

Let C be another set such that

C = { - 1}

Now, we know that C is a bounded set thus { - 1} is also an element of A

Also, we know:

inf(A) =

Therefore,

But

is an element of A and

This is contradictory, thus inf(A) does not exist.

Hence, proved.

**Answer:**

*8/9 (choice b)*

**Step-by-step explanation:**

The trigonometric ratios are based on the ratios of different sides.

If you remember SOH CAH TOA =

__s__ine (sin) __o__pposite __h__ypotenuse

__c__osine (cos) __a__djacent __h__ypotenuse

__t__angent (tan) __o__pposite __a__djacent

__________________________

This is a nuemonic for these ratios.

the opposite side is the side that is directly across from the reference angle, the hypotenuse is the longest side, and the adjacent side is the side other than these two.

So cos C = adjacent side / hypotenuse side.

Since 18 is greater than 16 and 9, 18 is the hypotenuse.

the adjacent side is the side other than the opposite side and the hypotenuse which is 16

therefore cos C = 16 / 18 = 8 / 9.

**Answer:**

156.95

**Step-by-step explanation:**

length x width x height

Midpoint formula

**Answer:**

(4,-4)

**Step-by-step explanation:**

(X,y)=(x1+X2) ,(y1+ y2)

= (-1+5), ( 1-5)

= (4, -4)

dosage, o?

Question: The number of milligrams of a certain medicine a veterinarian gives to a dog varies directly with the weight of the dog. If the veterinarian gives a 30-pound dog 3/5 milligram of the medicine, which equation relates the weight,w, and the dosage, d?

Answer: d= 1/50w

Explanation: I took the test in Edgenuity.

Hope this helps!