2 years ago

Sarah is going to invest $280 and leave it in an account for 9 years. Assuming the

Mathematics

1 answer:

Alisiya [41]2 years ago

5 0

Answer:

4.2%

Step-by-step explanation:

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Please help please help please help

uranmaximum [27]

It should be 986m

4(17x6)= 408
2(17x17)= 578

408+578=986

7 0

3 years ago

A toddler is 36 inches tall and grows about 3 inches per year. Which of the following functions represents the toddler's height,

8_murik_8 [283]

Answer

I think the answer could be B

8 0

2 years ago

Read 2 more answers

F(x) = 4x^2 - 3x + 2kx + 1

dybincka [34]

$f(x)=4x^2-3x+2kx+1=4x^2+(2k-3)x+1\\\\a=4;\ b=2k-3;\ c=1\\\\function\ has\ two\ zeros\ when\ \Delta=b^2-4ac > 0\\\\\Delta=(2k-3)^2-4\cdot4\cdot1=4k^2-12k+9-16=4k^2-12k-7 > 0\\\\a_k=4;\ b_k=-12;\ c_k=-7\\\\\Delta_k=(-12)^2-4\cdot4\cdot(-7)=144+112=256\\\\k_1=\frac{-b_k-\sqrt{\Delta_k}}{2a_k};\ k_2=\frac{-b_k+\sqrt{\Delta_k}}{2a_k}$

$\sqrt{\Delta_k}=\sqrt{256}=16\\\\k_1=\frac{12-16}{2\cdot4}=\frac{-4}{8}=-\frac{1}{2};\ k_2=\frac{12+16}{2\cdot4}=\frac{28}{8}=\frac{7}{2}\\\\a_k=4 > 0\ (up\ parabola\ arms-see\ the\ picture)\\\\Answer:k\in(-\infty;-\frac{1}{2})\ \cup\ (\frac{7}{2};\ \infty)$