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bcruz310
05.07.2020 •
Mathematics
Sam invests $6000 in two different accounts. The first account paid 12 %, the second account paid 7 % in interest. At the end of the first year he had earned $590 in interest. How much was in each account? $ at 12% $ at 7%
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Ответ:
The amount in the account at 12% interest is $3400 and the amount in the second account at 7% interest is $2600
Step-by-step explanation:
Let x be the amount in the account at 12% interest
So, 6000-x is the amount in the second account at 7% interest
First account:![SI=\frac{x \times 1 \times 12}{100}](/tpl/images/0701/7921/f5652.png)
Second account :![SI =\frac{(6000-x) \times 1 \times 7}{100}](/tpl/images/0701/7921/04cf4.png)
We are given that At the end of the first year he had earned $590 in interest.
So,![\frac{x \times 1 \times 12}{100}+\frac{(6000-x) \times 1 \times 7}{100}=590\\x=3400](/tpl/images/0701/7921/316f0.png)
So,the amount in the account at 12% interest is $3400
The amount in the second account at 7% interest =6000-x=6000-3400=2600
Hence the amount in the account at 12% interest is $3400 and the amount in the second account at 7% interest is $2600
Ответ:
Step-by-step explanation:
point slope form
y-y1=m(x-x1)
slope-intercept form
y=mx+b
slope formula
y2-y1/x2-x1
slope of line passing through (3.29,-9.19) & (3.29,4.72)
UNDEFINED
line perpendicular to y=3x-7 & passes through (3,5)
y-5 = -1/3(x-3)
slope of perpendicular lines
negative reciprocals (flip and change signs)
m --> -1/m
covering up method
only used with standard form
-4x + 7y = 56 Find x & y intercepts of equation
x = (-14,0) y = (0,8)
Terry is skiing down a steep hill. Terry's elevation E(t)
in feet after t seconds is given by E(t) = 2000 − 90t.
Write a complete sentence describing Terry's starting elevation and how it is changing over time.
Terry starts at an elevation of 2000 feet and descends at 90 feet per second.
If the graphs of two linear functions are perpendicular, describe the relationship between the slopes and the y-intercepts.
slope: negative reciprocals of one another.
y-intercept: There is no relationship.