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inessss [21]
3 years ago
13

Can some one please help me please!!!

Mathematics
1 answer:
aleksklad [387]3 years ago
6 0

Answer: 70a+21b

Step-by-step explanation:

By definition, equivalent expressions have the same value but they look different.

In order to solve this exercise you need to remember:

1) The multiplication of signs:

(+)(+)=+\\(-)(-)=+\\(-)(+)=-\\(+)(-)=-

2) According to the Distributive property:

a(b+c)=ab+ac\\\\a(b-c)=ab-ac

In this case you have this expresion:

7(10a+3b)

Then, in order to find an equivalent expression to 7(10a+3b) you need to simplify it applying the Distributive property (Remember that you must multiply each term inside the parentheses by 7)

Therefore, through this procedure you get the following equivalent  expression that shows the sum of exactly two terms:

7(10a+3b)=(7)(10a)+(7)(3b)=70a+21b

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Please help Explanation will be appreciated thanks,
Genrish500 [490]

Answer: A; 6.3%

Step-by-step explanation:

Problem 1

For the first problem, we first want to find y so that we can plug it into the expression.

We can use elimination method for the system of equations to solve.

3x+3y=21

3x-y=5

We subtract both equations to eliminate x.

4y=16                                        [divide both sides by 4]

y=4

Now that we know y, we can plug it into the expression.

\frac{4}{2} -3                                         [divide]

2-3                                         [subtract]

-1

We know that the answer is A.

--------------------------------------------------------------------------------------------------------

Problem 2

For the second problem, we need to know how to calculate percent error. The formula for precent error is \frac{|measured-exact|}{exact} *100%. We know that the exact value is 80 because the buyer was supposed to given 80. 75 is the measured value because that was what the buyer was given.

\frac{|75-80|}{80} *100%                               [subtract]

\frac{|-5|}{80} *100%                                   [solve absolue value]

\frac{5}{80} *100%                                     [divide]

0.0625*100%                               [multiply]

6.25

Since the problem said to round to one decimal place, we know that the answer is 6.3%.

4 0
3 years ago
Given s(x) = 2x - 3 and t(x) = 5x + 4. Find the formula and domain for v(x) = s (x) / t (x) and w(x) = t (x) / s (x)
Liula [17]
V(x) = (2x - 3)/(5x + 4)
The domain is all Real numbers except x = -4/5, because if x = -4/5 the denominator would be zero and you cannot divide by zero.
{x | x ∈ R, x ≠ -4/5}

w(x) = (5x + 4)/(2x - 3)
similarly, x ≠ 3/2
so, {x| x ∈ R, x ≠ 3/2}
8 0
4 years ago
Read 2 more answers
Why can you multiply or divide both terms of a ratio by the same number without changing the value of the ratio
o-na [289]
The ratio is rational and by multiplying or dividing the numbers included in the ratio by the same number, it's just like taking a fraction and taking it out of simplest form, it doesn't change the value of the ratio or the fraction in simplest form, it just changes the numbers

6 0
4 years ago
Find 2/3 of 3/4 of 24
Aleksandr-060686 [28]

Answer:

the answer is 12 which is a whole number

Step-by-step explanation:

i just multiplied them into my phone calculator and got the answer then checked my work. i really hope this helps and don't mind to BRAINLIEST PLZ

4 0
3 years ago
How do I turn 7 over 8 divided by 2 over 5 into a mixed fraction
tangare [24]
7/8 / 2/5 is equal to 7/8 x 5/2 which equals 35/16, 16 goes into 35 twice so there are 2 wholes there is a remaining of 3 so we put it as a fraction over 16 
the answer is 2 3/16 
5 0
3 years ago
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