they've invested to earn $20 in a savings account that offer 3% return on the investment the value of david's investment will be at least $400 after a period of

Answers

Answer 1

Answer: I=PRT
P=present amount
R=rate
T=time
basically
20+interest is more than or equal to 400
20+I>400
minus 20 both sides
I>380

solve
P=20
R=3%=0.03
T=?
I=PRT
380<I=PRT
380<20(0.03)(T)
380<0.6T
divide both sides by 0.6
633.33333<T
633.33 years at least

Answer 2

Answer:

Answer:T=20

Step-by-step explanation:

Plato

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Find the coordinates of the other endpoint of the segment, given midpoint(-9,-11) &endpoint(-6,-8).

Answers

Answer:

((-6 + x)/2, (-8 + y)/2) = (-9, -11)

(-6 + x)/2 = -9 (-8 + y)/2 = -11

-6 + x = -18 -8 + y = -22

x = -12 y = -14

The other endpoint is (-12, -14).

Ariana spent a quarter of her allowance on sweets and she put one third of the remainder in her piggy bank. If she had twenty dollars left, what was her allowance

Answers

Answer:

$40

Step-by-step explanation:

Ariana spent a quarter of her allowance

1 - 1/4 = 3/4 was left

put one third of the remainder in her piggy bank

1/3 * 3/4 = 1/4

She spent 1/4 and piggy banked 1/4

so the $20 she had left was half her allowance.

allowance was $40

Ariana gets a very large allowance!

Square root of 4+2 root 3

Answers

$(a+b)^2=a^2+2ab+b^2\ \ \ (*)\n\n\n√(4+2\sqrt3)=√(3+2\sqrt3+1)=\sqrt{\underbrace{(\sqrt3)^2+2\cdot\sqrt3\cdot1+1^2}_((*))}\n\n=√((\sqrt3+1)^2)=|\sqrt3+1|=\sqrt3+1$

$(a+b)^2=a^2+2\cdot a\cdot b+b^2\n \n4+2 √(3)=1^2+2\cdot1\cdot √(3)+ √(3) ^2\ \ \ \Rightarrow\ \ \ a=1\ \ \ \wedge\ \ \ b= √(3) \n \n4+2 √(3) =(1+ √(3) )^2\n \n \sqrt{4+2 √(3)} = \sqrt{(1+ √(3) )^2} =|1+ √(3) |=1+ √(3)$

there were 7 roses in the vase. Jessica cut some more roses from her flower garden. there are now 15 roses in the vase. how many roses did she cut?

Answers

Answer:

Jessica cut 8 roses.

Step-by-step explanation:

15-7=8

You have to subtract the amount she cut from the flower garden (15) to the amount which the vase had (7), in which you will get an answer of 8.

5 + 5+10+20+45+56+56+57+76