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2 years ago

The mean of three numbers is 70. if two of the numbers are 55 and 65 what is the third number

2 answers:

6 0

90
55+65=120
there are 3 numbers and when you divide them it makes 70.
70 x 3 = 210
210 - 120 = 90
55 + 65 + 90 = 210
210 / 3 = 70

Evgesh-ka [11]2 years ago

4 0

I thin the third number would be 90 because if the mean of 3 numbers is 70 then multiply 70 an three and you get 210. Then add 55 and 65 and you get 120.Then do 210-120 and you get 90 so 90 is the third number.

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Which graph represents a linear function? A coordinate plane is shown with a way line beginning along the x axis and continuing

Sliva [168]

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2 years ago

Read 2 more answers

Martin chose two of the cards below. When he found the quotient of the numbers, his answer was -16/9. Write the division problem

Sveta_85 [38]

Answer:

The required division problem he must solve is:

$\frac{2}{3} \div \frac{-3}{8} =\frac{2}{3}\times\frac{-8}{3}=\frac{-16}{9}$

Step-by-step explanation:

Consider the provided information.

Martin chose two of the cards below. When he found the quotient of the numbers, his answer was -16/9.

As we know that the quotient of the number is a negative number.

Therefore, the sign of both numbers must be different,

Thus we can concluded he must select $\frac{2}{3}$ as one of the card, so that product is a negative number.

Let the selected card be x.

$\frac{2}{3} \div x =\frac{-16}{9}\\\\x=\frac{2}{3}\div\frac{-16}{9}\\\\x=\frac{2}{3}\times\frac{-9}{16}\\\\x=\frac{-3}{8}$

Hence, the two cards should be $\frac{2}{3}$ and $\frac{-3}{8}$

The required division problem he must solve is:

$\frac{2}{3} \div \frac{-3}{8} =\frac{2}{3}\times\frac{-8}{3}=\frac{-16}{9}$

3 0

2 years ago

Boris chooses three DIFFERENT numbers.

g100num [7]

Answer:

4, 5, 27.

Step-by-step explanation:

Let us find our numbers using given information.

Factors of 20 are: 1,2,4,5,10 and 20.

Let us try by taking number 4 and 5.

$36-(4+5)=36-9=27$

We can see that $3^{3} =27$

Now let us find sum of these numbers.

$4+5+27=36$

Therefore, numbers chosen by Boris will be 4, 5 and 27 as these numbers satisfies our all conditions.

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2 years ago

At smith mountain lake boat rentals, it costs $25 per hour to rent a pontoon boat, plus a one-time charge for cleaning. The Beng

ludmilkaskok [199]

Answer:

The given equation in slope intercept form is

226.50 = 7.5 (25) + 39

Step-by-step explanation:

The SLOPE INTERCEPT form of a equation is y = m x + c

The per hour cost for rental of boat = $25 per hour

Let us assume the one time cleaning charge = $ k

The boat is booked from 11 am : 6 : 30 pm

So, the number of hours boat was used = 7 . 5 hours

Hence, the cost for engaging boat for 7.5 hours

= 7.5 (cost per hour ) = 7.5( $25) = $187 . 5

Total amount paid by the family = $226. 50 = Fixed cleaning charge + rate for 7.5 hours

⇒The cleaning fee paid by the family = $226. 50 - $187 . 5 = $39

According to question:

Total amount paid = Number of hour x (cost per hour ) + Cleaning fee

Hence, the given equation in slope intercept form is

226.50 = 7.5 ($25) + $39

8 0

1 year ago

The grades on a history midterm at Gardner Bullis are roughly symmetric with μ = 69 μ=69mu, equals, 69 and σ = 3.5 σ=3.5sigma, e

katrin2010 [14]

Answer:

-1.14

Step-by-step explanation:

The given information in statement is

mean=μ=69

standard deviation=σ=3.5

Let X be the Ishaan's exam score

X=65

The Z score can be computed as

$z=\frac{x-mean}{standard deviation}$

$z=\frac{65-69}{3.5}$

z=-1.1429

z=-1.14 (rounded to two decimal places).

Thus, the computed z-score for Ishaan's exam grade is -1.14.

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2 years ago