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3 years ago

Please help find the percent of decrease?!

Mathematics

2 answers:

Maslowich3 years ago

5 0

you should get 29% for your answer on this one

Paul [167]3 years ago

4 0

The easiest way to do do this is to first find out how much % 500 is of 700

first, we can just set it up as a simplified fraction
$\frac{7}{5}$
which is equal to..
$1.4$

then we divide 100 by this number
$100 \div 1.4 = 71.4285...$

*now to check*
multiply the quotient by .01 to get .7142...

then multiply that by 700

we should get a product of 500, confirming our answer

now that we're sure, subtract 71 from 100 to find the percentage decrease

$amswer = 29\%$

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For what value of “a”are the graphs of 5y = -2x + 10 and 3y = aX- 15 parallel

Pie

Answer:

a = -6/5

Step-by-step explanation:

For the graphs to be parallel the graphs should have same slope(m)

So we rewrite both our equations in the slope-intercept form then compare the slope to find the value of a like this,

$y=mx+b$

This equation is the slope-intercept form we convert both our equations in this form firstly taking equation 1

$5y=-2x+10\\\\y=\frac{-2x+10}{5} \\\\y=\frac{-2}{5}x+\frac{10}{5} \\\\y=\frac{-2}{5}x+2$

so if we compare it with y = mx + b the coefficient of x is m and hence

m= -2/5 now solving for equation 2

$3y=ax-15\\\\y=\frac{ax-15}{3} \\\\y=\frac{ax}{3}-\frac{15}{3} \\\\y=\frac{a}{3}x-5\\\\$

so here if we compare it with y = mx + b the coeffienct of x is a/3 so since parallel lines have same slope by the formula:

$m_1=m_2$

we equation both the slope to each other to find the value of a like this,

$m_1=m_2\\\\\frac{-2}{5}=\frac{a}{3}\\\\-2(3)=a(5)\\\\-6=5a\\-6/5=a$

so the value of a equals

a= -6/5

8 0

3 years ago

Estimate then record 721×8

Hitman42 [59]

721*8= 5768.................

8 0

3 years ago

Read 2 more answers

If -3(x + 6) = x - 2, then x = -4.

Anon25 [30]

3(x + 6) = x - 2

3(-4+6)= -4-2

mutiply the bracket by 3

(3)(-4)= -12

(3)(6)= 18

-12+18= -4-2

6= -4-2

6= -6

Answer:

No solution

4 0

3 years ago

An element with mass 780 grams decays by 16.3% per minute. How much of the element is remaining after 16 minutes, to the nearest

vitfil [10]

Exponential decay is a very common process especially when we are talking about radioactive materials. So, there is already a common formula for this type of behavior which is written below:

A = Pe^-rt
where
A is the amount left after time t
P is the initial amount at t=0
r is the rate

Substituting the values,
A = (780 g)(e^-0.163*16)
A = 57.5 g

8 0

4 years ago

The shorter leg of a 30 60 90 triangle is 6.4 inches long. Find the perimeter.

kogti [31]

The perimeter is 38.4 inches

8 0

3 years ago