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3 years ago

Difference of a number and -3 is 6. what is the number

1 answer:

5 0

Let x = the number we are looking for:

Difference means that we subtract:

$x-(-3)=6$

Two negative signs turn it into one positive sign (a plus):

$x+3=6$

We need to get x by itself, so we subtract 3 from both sides:

$x=3$

So now we know that the number we were asked to find is 3.

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A researcher identifies a sample of teenagers and chooses two males, age 16

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I thinks it is matching pairs for random assignment on gender, age, & income status but I’m not sure

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2 years ago

Evaluate5− t/3 when t=12

Novosadov [1.4K]

Answer:

$1$

Step-by-step explanation:

$5 - \frac{t}{3} = \frac{5}{1} - \frac{12}{3} = 5 - 4 = 1$

$5 - \frac{t}{3} = \frac{5}{1} - \frac{12}{3} = \frac{15 - 12}{3} = \frac{3}{3} = 1$

Hope this helps ;) ❤❤❤

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2 years ago

A bag contains 4 gold marbles, 5 silver marbles, and 29 black marbles. Someone offers to play this game: You randomly select one

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Answer:

Step-by-step explanation:

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2 years ago

Liam is making barbecue ribs over a fire. The internal temperature of the ribs when he starts cooking is 40°F. During each hour

Soloha48 [4]

Answer: You need to wait at least 6.4 hours to eat the ribs.

t ≥ 6.4 hours.

Step-by-step explanation:

The initial temperature is 40°F, and it increases by 25% each hour.

This means that during hour 0 the temperature is 40° F

after the first hour, at h = 1h we have an increase of 25%, this means that the new temperature is:

T = 40° F + 0.25*40° F = 1.25*40° F

after another hour we have another increase of 25%, the temperature now is:

T = (1.25*40° F) + 0.25*(1.25*40° F) = (40° F)*(1.25)^2

Now, we can model the temperature at the hour h as:

T(h) = (40°f)*1.25^h

now we want to find the number of hours needed to get the temperature equal to 165°F. which is the minimum temperature that the ribs need to reach in order to be safe to eaten.

So we have:

(40°f)*1.25^h = 165° F

1.25^h = 165/40 = 4.125

h = ln(4.125)/ln(1.25) = 6.4 hours.

then the inequality is:

t ≥ 6.4 hours.

4 0

2 years ago