15.6 cm
8.8 cm
x = [ ? ]cm

x≈4.1

Step-by-step explanation:

15.6/2=7.8

Use Pythagorean Theorem

7.8^2+x^2=8.8^2

60.84+x^2=77.44

x^2=16.6

x=√16.6≈4.1

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!