Write the abbreviations for a. fifteen degrees below zero fahrenheit b. seventy-eight degrees below zero celsius c. twenty-five degrees celsius d. one hundred ninety-nine degrees fahrenheit

a)   -15°F

b)    -78°C

c)    25°C

d)    199°F

Temperature below zero means that the temperature will be negative and it's magnitude is according to what is given.

a)

Fifteen degrees below zero Fahrenheit.

This means that the temperature is represented by:

                 -15°F

b)

Seventy-eight degrees below zero Celsius

Again the temperature is negative.

i.e.     -78°C

c)

Twenty-five degrees Celsius

Here the temperature is above zero and hence is represented by:

           25°C

d)

One hundred ninety-nine degrees Fahrenheit

The temperature will be positive since it is not mentioned that it is below zero.

                     199°F

you would have to sell 24 bracelets.

step-by-step explanation:

84/3.5 = 24

x =-.20752

step-by-step explanation:

4^(x+2)=12

4^(x+2)=12

take the log base 4 on each side

log 4 (4^(x+2) = log 4(12)

we know log b(a^y) = y log b (a)

(x+2) log 4(4) = log 4 (12)

x+2 = log 4 (12)

we know   logb c = loga c/loga b

we want to convert to base 10   so a = 10

by default, we do not write the 10   c = 4   and b = 10

log4 10 = log 12/log 4

log4 10 = log 12/ log 4

x+2 = log 12/ log 4

subtract 2 from each side

x +2 -2 = log 12/ log 4 -2

x = 1.79248125 -2

x =-.20752