Correct answer only !

use the imaginary number i to rewrite the expression.

D 7i

Step-by-step explanation:

sqrt(-49)

We know that sqrt(ab) = sqrt(a) sqrt(b)

sqrt(49) sqrt(-1)

We know that sqrt(-1) = i

Taking the principal square root of 49

7i

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

d. all of the above

step-by-step explanation: