What is the answer to 7//10)+(-3/5)

3/8

Step-by-step explanation:

Find and apply the LCD.  In this case we have the three denominators 8, 10 and 5, which in factored form are 2(4), 2(5) and 1(5).  The factors that make up the LCD are 2, 4 and 5, or 40.  Note that 8, 10 and 5 all divide evenly into 40.

So our expression, 7/8-(-1/10)+(-3/5), can be rewritten as:

35/40 + 4/40 - 24/40, which simplifies first to 39/40 - 24/40, and then to:

15/40.

This 15/40 reduces to 3/8.

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!

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed