Simple, first, change 70% into 0.7
thus,
21= 0.7*n
21/0.7=0.7n/0.7
30=n
Thus, your answer, is 30.
Answer:
sin0 = -12
Step-by-step explanation:
tan0 = sin/cos
12/5 = sin / -15/3
sin = tan0 x cos0 = 12/5 x -15/3 = -12
Answer:
<h3>
first term: <u>
a₁ = 14</u></h3><h3>
the common difference: <u>
d = -3</u></h3>
Step-by-step explanation:
The sum of the 3rd and 8th term is:
The sum of the first seven terms is 35:
Answer:
Step-by-step explanation:
Let z and b represent the number of packs that Zack and Brian bought, respectively. Then the problem statement tells us ...
b = 2z -3 . . . . . . . Brian bought 3 fewer than twice what Zack bought
b + z = 30 . . . . . . they bought a total of 30 packs
Using the first equation to substitute into the second, we have ...
(2z -3) +z = 30
3z -3 = 30
3z = 33 . . . . . . add 3
z = 11
b = 2·11 -3 = 22 -3 = 19
_____
<em>Check</em>
b + z = 19 + 11 = 30 . . . . answer checks OK
Zack bought 11 packs; Brian bought 19 packs of gum.
Answer:
the answer is 10.3
Step-by-step explanation:
