The product of two numbers is 21. if the first number is -3, which equation represents this situation and what is the second number?
a.
the equation that represents this situation is x - 3 = 21. the second number is 24.
b.
the equation that represents this situation is 3x = 21. the second number is 7
c.
the equation that represents this situation is -3x = 21. the second number is -7.
d.
the equation that represents this situation is -3 + x = 21. the second number is 18.

C.

The equation that represents this situation is -3x = 21. The second number is -7.

Step-by-step explanation:

 The equation that represents this situation is -3x = 21. The second number is -7 (option C).

Step-by-step explanation:

Hi, the correct option is C.

We have to analyze the information given to write the equation and corroborate the option chosen.

So:

first number = -3  

Product means the result of multiplication, in this case, the product is number 21.

Mathematically speaking:

-3x= 21

x = 21/-3

x = -7

In conlclusion, he equation that represents this situation is -3x = 21. The second number is -7 (option C).

Feel free to ask for more if it´s necessary or if you did not understand something.

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24