MATHEMATICS HIGH SCHOOL

Please, help me I’m so dumb

Answers

Answer 1

Answer:

Answer:

Step-by-step explanation:

You know that 9 = 10 - 1.

Then 9 of something is equal to 10 of it less one of it. Here, that "something" is four.

$\begin{array}{cl}9*4&=10\text{ fours}-\boxed{1}\text{ four}\n&=\boxed{40}-4\n&=\boxed{36}\end{array}$

_____

Comment on this math

This illustrates a shortcut for multiplying by 9 that can be convenient for mental arithmetic. The idea is to multiply by 10, which just involves adding 0 (or moving the decimal point), then subtract the original number.

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For which equation is a = 4 not the solution? 6a = 24
9a = 36
5a = 54
8a = 32

Answers

5a=54 is not a correct statement. 5x4=20, not 54

He coordinates below represent two linear equations. How many solutions does this system of equations have?

Line 1
x y
–3 5
0 4
Line 2
x y
0 4
6 2
A.
0

B.
exactly 1

C.
exactly 2

D.
infinitely many

Answers

$\hbox{Line 1:}\nm=(5-4)/(-3-0)\nm=(1)/(-3)\nm=-(1)/(3)\n\n\hbox{Line 2:}\nm=(4-2)/(0-6)\nm=(2)/(-6)\nm=-(1)/(3)$

Both lines have the same slope, which means they are parallel. They also pass through the same point $(0,4)$ . This means they're overlapping so there is infinitely many solutions.

The question is in the pic below

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Answer:

k = -5

w = -8

f = -10

Step-by-step explanation:

N^2-5n=3
Round to the nearest hundredth

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Let's solve your equation step-by-step.n2−5n=3Step 1: Subtract 3 from both sides.n2−5n−3=3−3n2−5n−3=0Step 2: Use quadratic formula with a=1, b=-5, c=-3.n=−b±√b2−4ac2an=−(−5)±√(−5)2−4(1)(−3)2(1)n=5±√372n=52+12√37 or n=52+−12√37Answer:n=52+12√37 or n=52+−12√37

Someone Help please?!?!

Answers

A is true statement.

A candy distributor needs to mix a 10% fat-content chocolate with a 40% fat-content chocolate to create 100 kilograms of a 16% fat-content chocolate. How many kilograms of each kind of chocolate must they use?

Answers

$x-how\ many\ kilograms\ of\ 10\%\ fat-content\ chocolate\n \n10\%\cdot x+40\%\cdot(100-x)=16\%\cdot 100\n \n 0.10x+0.4(100-x)=0.16\cdot 100\n \n0.1x+40-0.4x=16\n \n-0.3x=-24\ /:(-0.3)\n \nx= (24)/(0.3) \n \nx=80\ \ \ \Rightarrow\ \ \ 100-x=100-80=20\n \nAns.\ 80\ kg\ -of\ 10\%\ fat-content\ chocolate;\ \n20\ kg-of\ 40\%\ fat-content\ chocolate$

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