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3 years ago

If a test is worth 90 points, how many points are needed to get a B?

Mathematics

2 answers:

nirvana33 [79]3 years ago

8 0

Answer:

70%

Step-by-step explananation:

sorry for the previous answer I was thinking u meant something else

Ainat [17]3 years ago

4 0

Answer:

A 70%

Step-by-step explanation:

Because when the top score is 100 then 80 is a B therefore you should just minus 20 from 90 and that should be your B score.

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Mr. Jones and Mr. Smith both plan to retire in 5 years. Mr. Jones has invested $250 per

nataly862011 [7]

Answer:

i don't know, i just want to know if you got it right

Step-by-step explanation:

6 0

3 years ago

1. At a temperature of 22oC, a liquid that has a volume of 5 mL. The liquid also has a mass of 3 grams. What is the density of t

bagirrra123 [75]

Answer:

The first option.

Step-by-step explanation:

Use the density formula: p = m/v

M = mass(3); B = volume(5)

3/5 = .6

Hope this helps! Have a nice day!

5 0

3 years ago

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Let II be the tangent plane to the graph of f(x, y) = 8 – 2x^2 – 3y^2 at the point (1, 2,-6). Let S, x² + y^2 + z = 4 be another

stealth61 [152]

Let $F(x,y,z)=f(x,y)-z$ . The tangent plane to $f(x,y)$ at (1, 2, -6) has equation

$\nabla F(1,2,-6)\cdot(x-1,y-2,z+6)=0$

We have

$\nabla F(x,y,z)=(-4x,-6y,-1)\implies\nabla F(1,2,-6)=(-4,-12,-1)$

Then the tangent plane has equation

$(-4,-12,-1)\cdot(x-1,y-2,z+6)=0\implies -4(x-1)-12(y-2)-(z+6)=0\implies 4x+12y+z=22$

Let $g(x,y)=4-x^2-y^2$ , and $G(x,y,z)=g(x,y)-z$ . The tangent plane to $S$ at a point $(a,b,c)$ is

$\nabla G(a,b,c)\cdot(x-a,y-b,z-c)=0$

We have

$\nabla G(x,y,z)=(-2x,-2y,-1)\implies \nabla G(a,b,c)=(-2a,-2b,-1)$

so that this plane has equation

$(-2a,-2b,-1)\cdot(x-a,y-b,z-c)=0\implies2ax+2by+z=2a^2+2b^2+c$

In order for this plane to be parallel to the previous plane, we need to have

$\begin{cases}2a=4\\2b=12\end{cases}\implies a=2,b=6\implies g(a,b)=c=-36$

so the point we're looking for is (2, 6, -36).

6 0

3 years ago

If sin(1/x^2+1) is an anti derivative for f(x), then what is the limit of f(x)dx from 1 to 2?

liubo4ka [24]

By the fundamental theorem of calculus,

$\displaystyle\int_1^2f(x)\,\mathrm dx=\sin\dfrac1{2^2+1}-\sin\dfrac1{1^2+1}$

7 0

3 years ago

BRAINLY!! PLEASE HELP ME!! IF YOUR GOOD AT MATH!!

riadik2000 [5.3K]

A. Here's a fifth degree polynomial,

f(x) = x⁵ + 4x⁴ - 14x² + 9

It's in standard form, each term a constant coefficient times a whole number power of x (including the constant, which we can think of as the coefficient on x⁰=1), with the terms sorted from highest degree (highest power on x) to lowest.

B. The closure of addition wrt polynomials just means when we add two polynomials we get another polynomial.

f(x) = x⁵ + 4x⁴ - 14x² + 9

g(x) = -2x⁴ + x

f(x)+g(x) = x⁵ + 2x⁴ - 14x² + x + 9

We added two polynomials, we got another one, that's all closure is.

5 0

3 years ago

Read 2 more answers