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svetoff [14.1K]
3 years ago
9

Rehman invests his summer earnings of $3050. He invests past of the money at 8%/year, and the rest at 7.5%/year. After 1 year, t

hese investments earn 242$ in simple interest. How much did he invest at each rate?
Mathematics
1 answer:
sertanlavr [38]3 years ago
5 0

Answer:

let he invest x part of earning at the rate of 8%

simple interest = P*T*R/100 = x*1*8/100 = 0.08x

His invest at the rate of 7.5% = 3050 - x

Again simple interest = P*T*R/100 = (3050 - x)*1*7.5/100 = 228.75 - 0.075x

N0w acc0rding to question

0.08x + 228.75 - 0.075x = 242

0.005x= 13.25

x = 2650

rehman invest 2650 at 8% per year

He invest (3050-2650) = 400 0n 7.5% per year

Step-by-step explanation:

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\bf \begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
%   (a,b)
&({{ 0}}\quad ,&{{ 4}})\quad 
%   (c,d)
&({{ -4}}\quad ,&{{ 1}})
\end{array}
\\\\\\
% slope  = m
slope = {{ m}}= \cfrac{rise}{run} \implies 
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\bf y-{{ y_1}}={{ m}}(x-{{ x_1}})\qquad 
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once you get the slope and solve for "y", that'd be the equation of the line.
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3 years ago
Is it possible to solve a quadratic equation that is not factorable over the set of integers? Explain.
zvonat [6]

Answer:

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Step-by-step explanation:

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To find two roots of the equation we can always use the formula given below to solve a quadratic equation,

For the quadratic equation,

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Help i don't know what the answer is ​
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The answer to that is -4!!
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