Andy estimated that he would need 77 feet of lumber for a tree house project. he later found that the actual amount of lumber needed was 66 feet. what was the percent error of andy's estimation?

It makes a difference how you interpret this question. He needed 66 feet of lumber. That is the key number that you have to use. He had (77 - 66) = 11 feet of lumber too much.

% error = (11/66) * 100 = 16.7% error.<<< Answer

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation:

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!