MATHEMATICS MIDDLE SCHOOL

How do you solve and check it
-5 - 5y =0
y=8x

Answers

Answer 1
Answer: -5-5y=0
y=8x

substitute the value of y
-5-5(8x)=0
-5-40x=0
add 5 to both sides.
-40x=5
divide both sides by -40
x=-5/40
simplify gcf=5
x=-1/8


checking:
Y=8x
y=8(-1/8)
y=-1
Substitute it to the 1st equation
-5-5(-1)=0
-5+5=0
0=0

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A cell phone company orders 500 new phones from a manufacturer. If the probability of a phone being defective is 2.9%, predict how many of the phones are likely to be defective. Round to the nearest whole number. 12 phones 15 phones 18 phones 145 phones

Answers

Answer:

15 phones, option B.

Step-by-step explanation:

A cell phone company orders new phones = 500

The probability of a phone  is being defective = 2.9%

2.9% of 500 phones are = (2.9)/(100) × 500

0.029 × 500 = 14.5 rounded to the nearest whole number is 15

The probability of 15 phones are defective out of 500 phones.
500  x 0.029 = 14.5 

answer
about 15 phones 

Find the surface area of a rectangle prism

Answers

surface area
it is 6 rectangles
rectangle area=legnth times width

but yo have legnth width and height
how does we do this?
answer
recognize that the rectanles come in pairs
rectanels that are oposite each other have equal areas
so we have
top=bottom=legnth times width
front face=back face=legnth times height
R side face and L side face=width times height

since there are 2 of each
SA=2(LW)+2(LH)+2(WH)
undistribute 2
SA=2(LW+LH+WH)

tada
(note: L=legnth, W=width, H=height)


and give your answer in square units

What is 2/8 x 2? I got different answers with different tricks. What is the correct answer?

Answers

2/8(2)

= (2/8)(2)

= (1/4)(2/1)

= (1)(2)/(4)(1)

= 2/4 (fraction form )

= 0.5 ( decimal )


I hope that's help and have a great night

I need help ASAP please this is killing me

Answers

Ok, so from what I see, they are related proportionally. One side of a square is related proportionally because in order to find the length, it's 2L(length)+2W(width). So without a side(such as width or length), you couldn't find the parameter.
For the area, a side is related proportionally because you need to multiply Length x Width(l x w). 

75% of what number is 105

Answers

75 percent of the number 140 is 105.

Let the unknown number be x.

Percentage is defined as a given part or amount in every hundred. It is a fraction with 100 as the denominator and is represented by the symbol "%".

Here, 75% of x is 105

75% of x= 105

75/100 ×x= 105

0.75x=105

x=105/0.75

x= 140

Therefore, 75 percent of the number 140 is 105.

To learn more about the percentage visit:

brainly.com/question/24159063.

#SPJ6
140.75n=105Get n by itself by dividing by .75.Rules say what you do to one side of equation you must also do the other so divide 105 by .75N= 140

PLEASE HELP I GIVE THANKS

Answers

For any triangle problem with finding a length, use the Pythagorean theorem; a^(2) + b^(2) = c^(2)
x=17cm, y=8cm
17²+8²=z²
289+64=z²
353=z²
√353=√(z²)
√353=z
The answer is D: √353 cm
Pathagreom therom a^2+b^2=c^2 where c is the hypotenuse, or the longest side

so you have (8)^2 + z^2 = (17)^2

so 64 + z^2 = 289

next subtract 64 from the left and right side of the equation
64 + z^2 = 289
-64            -64

z^2=225
 then take the square root and you get z=15
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