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3 years ago

PLA HELP ME ASAP FOR 7, 8, and 9 (SHOW WORK!) POINTS!!!

Mathematics

1 answer:

kykrilka [37]3 years ago

7 0

7.D is the correct answer. I simplified 12/27 to 4/9 then i try to see if 4/9 is equivalent to 20/45 and it is you multiply 4 and 9 by 5= 20/45

8. 1.4*2.1=2.94 then 2.94/1.5= 1.96 so c=1.96

9. Explanation You multiply- 5/8 * 3/5 then divide = answer divided by 2/3

Solving: 5/8*3/5= 3/8 then 3/8 divided by 2/3, flip second number and then switch the division sign to multiplication sign so it should be like this : 3/8 * 3/2= 9/16
answer= 9/16

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Complete the ratio table.

maxonik [38]

ANSWER: the ratio of apples to bananas would be 135:70 hope this helps

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3 years ago

Substitute for y and rewrite the system of equations as a single equation which can be used to solve for x.

Vlada [557]

Answer:

x = 3 and y = 1

Step-by-step explanation:

Given equations

y=3x-8 and y=4-x

We will substitute y from second equation in the first and get:

4-x = 3x-8 first we will add (+x) to both sides and get

4-x+x = 3x+x-8 => 4 = 4x-8 now we will add (+8) to the both sides and get

4+8 = 4x-8+8 => 12 = 4x now we will change the sides of equation and get

4x = 12 => x = 12/4 = 3 => x=3 now we will replace x=3 in the second equation

y= 4-x = 4-3=1 => y=1

Finally we have (x , y) = ( 3 , 1)

God with you!!!

7 0

3 years ago

Find the equation of the line shown.

ExtremeBDS [4]

Answer: y = -1/4x + 2
explanation: line passes through y axis on 2, so 2 is your y-intercept. rise/run is ur slope, which is -1/4 .

3 0

3 years ago

'Polonium-210 is a radioactive substance with a half-life of 138 days. If a nuclear

Tatiana [17]

Answer:

<u>59.0891 g (rounded to 4 decimal places)</u>

Explanation:

<em>Half-life time</em> of a radioactive substance is the time for half of the substance to decay.

Thus, the amount of the radioactive substance that remains after a number n of half-lives is given by:

$A=A_0\cdot (1/2)^n$

Where:

A is the amount that remains of the substance after n half-lives have elapses, and

A₀ is the starting amount of the substance.

In this problem, you have that the half-live for your sample (polonium-210) is 138 days and the number of days elapsed is 330 days. Thus, the number of half-lives elapsed is:

330 days / 138 days = 2.3913

Therefore, the amount of polonium-210 that will be left in 330 days is:

$A=310{g}\cdot (1/2)^{2.3913}=59.0891g$

5 0

3 years ago

Complete the table below to find solutions to the linear equation 4x + y = -40.

Pepsi [2]

Answer:

(1,-44), (2,-48),(3,-52).......

Step-by-step explanation:

4(1)+y=-40

4+y=-40

y=-40-4

y=-44

(1,-44)

4 0

2 years ago