Alana buys one shirt with a regular price of p dollars and 2 sweaters with a regular price of s dollars. shes uses a coupon so that she pays only half the regular price. write an expression that shows how much money alana spends in all. then exlpain the expression.

c = ½(p + 2s)

Step-by-step explanation:

 Let c = the total cost

       p = cost of one shirt

     2s = cost of two sweaters

p + 2s = total cost before discount

But Alana paid only half the regular price, so

c = ½(p + 2s)

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.

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: