7s + 5 for s =3 evaluate the expression

26

Step-by-step explanation: Here, we have the expression 7s + 5 and we want to evaluate the expression when s is equal to 3.

To evaluate an expression, we simply plug the value

of the variable into the expression and solve.

So here, since s is equal to 3,

we have 7(3) + 5.

Notice that I used parentheses around the 3. It's always a good idea to use parentheses when substituting/plugging in numbers for variables.

Solving from here, 7(3) is equal to 21.

So we have 21 + 5 which is equal to 26.

So the value of our expression

when s is equal to 3 is 26.

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.