Answer:
4x-1
Step-by-step explanation: All you are doing is combining x and 3x which equals 4x and coming 4 and -5 which equals -1. So the answer will be 4x-1.
Answer:
56
Step-by-step explanation:
sum of 3 floors, and you dont know the three floors so well name each x, so
x+x+x=168
3x=168
x=56
so each floor is 56ft
Answer: 25 nickels
Step-by-step explanation:
EQUATIONS:
quantity: n + d = 63
value: 5n + 10d = 505
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Divide thru the 2nd equation by 5 to get:
n + 2d = 101
----------------
Subtract that from the 1st equation:
-d = -38
d = 38 (# of dimes)
---------------
Substitute that into n+d=63 to solve for "n":
n + 38 = 63
n = 25 (# of nickels)
It can be b), c) and d).
b) because it says the sum of three angles — this one’s the most obvious, as we can look at x, y and z as three different angles that sum up to 180.
c) works because 3a is, in essence, a + a + a, which we can look at as the sum of 3 angles that adds up to 180.
d) because we already have 2 angles, and “a” is just an unknown angle. It all sums up to 180.
a) and e) dont work because they involve multiplying (x*y*z and x*x*x) and the problem says we need to look for the sum of angles, not the product. :)
Using change of base
log5/log 625
both logs cancels
then becomes 5/625
+ 1/4
