-7 times what equals 2? i’ll give brainliest

Mathematics

1 answer:

lisov135 [29]4 years ago

4 0

Answer:-3.5

Step-by-step explanation:

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27. The interest rate that doubles a sum in 10 years is a) 12% b) 11% c) 10% d) 9%

avanturin [10]

Answer:

Interest rate of 7%.

Step-by-step explanation:

The compound interest formula is given by:

$A(t) = P(1 + \frac{r}{n})^{nt}$

Where A(t) is the amount of money after t years, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per year and t is the time in years for which the money is invested or borrowed.

In this question:

We want to find t for which $A(t) = 2P$ when $n = 1, t = 10$ . So

$A(t) = P(1 + \frac{r}{n})^{nt}$

$2P = P(1 + r)^{10}$

$(1 + r)^10 = 2$

$\sqrt[10]{(1 + r)^10} = \sqrt[10]{2}$

$1 + r = 1.07$

$r = 0.07$

So a interest rate of 7%.

5 0

3 years ago

What is the value of x? 3(-9 - 4x) - 4= 8x - 9(x + 12)

Gemiola [76]

Answer:

x=7

Step-by-step explanation:

uhhh yes

5 0

3 years ago

Read 2 more answers

What percent of 8 is 6

vodomira [7]

if we take 6 to be the 100%, what is 8 off of it in percentage?

$\begin{array}{ccll} amount&\%\\ \cline{1-2} 6&100\\ 8&x \end{array}\implies \cfrac{6}{8}=\cfrac{100}{x}\implies \cfrac{3}{4}=\cfrac{100}{x} \\\\\\ 3x=400\implies x=\cfrac{400}{3}\implies x=133.\overline{3}$