jerico9184
17.03.2020 •
Mathematics
The expression 1.01\cdot1.005^t1.01⋅1.005
t
1, point, 01, dot, 1, point, 005, start superscript, t, end superscript gives the amount of money, in thousands of dollars, in Carter's savings account t years after he opens it.
What does 1.011.011, point, 01 represent in this expression?
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Ответ:
Carter's initial balance (in thousands)
Step-by-step explanation:
The expression seems to indicate that Carter's savings are earning 0.5% interest per year. The overall multiplier, 1.01, appears to be Carter's initial balance. It is in thousands.
Ответ:
(2y - 3) • (4y2 + 6y + 9)
Step-by-step explanation:
Step by step solution :
Step 1 :
Equation at the end of step 1 :
23y3 - 27
Step 2 :
Trying to factor as a Difference of Cubes:
2.1 Factoring: 8y3-27
Theory : A difference of two perfect cubes, a3 - b3 can be factored into
(a-b) • (a2 +ab +b2)
Proof : (a-b)•(a2+ab+b2) =
a3+a2b+ab2-ba2-b2a-b3 =
a3+(a2b-ba2)+(ab2-b2a)-b3 =
a3+0+0+b3 =
a3+b3
Check : 8 is the cube of 2
Check : 27 is the cube of 3
Check : y3 is the cube of y1
Factorization is :
(2y - 3) • (4y2 + 6y + 9)
Trying to factor by splitting the middle term
2.2 Factoring 4y2 + 6y + 9
The first term is, 4y2 its coefficient is 4 .
The middle term is, +6y its coefficient is 6 .
The last term, "the constant", is +9
Step-1 : Multiply the coefficient of the first term by the constant 4 • 9 = 36
Step-2 : Find two factors of 36 whose sum equals the coefficient of the middle term, which is 6 .
-36 + -1 = -37
-18 + -2 = -20
-12 + -3 = -15
-9 + -4 = -13
-6 + -6 = -12
-4 + -9 = -13
For tidiness, printing of 12 lines which failed to find two such factors, was suppressed
Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored
Final result :
(2y - 3) • (4y2 + 6y + 9)