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Maksim231197 [3]

2 years ago

13

How do I do math expressions?

1 answer:

dimaraw [331]2 years ago

3 0

1.Know the order of operations.<span> (pemdas)
</span>2. Start by solving all of the terms in parentheses.
3.Solve the exponents.
4.Solve the multiplication problems in your expression.
<span>5.Move on to <span>division
</span></span>6.Add.
7.Subtract.
8.Review your expression.

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lys-0071 [83]

First set everything to 0.
${x}^{2} + x - 5$
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Then input everything into the quadratic formula and either solve by hand or use a calculator.
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Oksanka [162]

The product has decreased by 80 %

<em><u>Solution:</u></em>

The product of the original numbers: xy

One number is decreased by 75 %

Let x be the number decreased by 75 %

new number = x - 75 % of x

$new\ number = x - 75 \% \times x\\\\new\ number = x(1-75 \%)\\\\new\ number = x(1-\frac{75}{100}) = x(1-0.75) = 0.25x$

Another number is decreased by 20 %

Let y be the number decreased by 20 %

new number = y - 20 % of y

$new\ number = y - 20 \% y\\\\new\ number = y(1-20 \%)\\\\new\ number = y(1-\frac{20}{100}) = y(1-0.2) = 0.8y$

<em><u>Now the product is given as:</u></em>

$product = 0.25x \times 0.8y = 0.2xy$

<em><u>Now we have to find the percent decreased</u></em>

Subtract new product and original product and then divide by original product . Multiply the result by 100 to get percentage

$percent\ decrease = \frac{0.2xy - xy}{xy} \times 100\\\\percent\ decrease = \frac{-0.8xy}{xy} \times 100 = -0.8 \times 100 = -80$

Here negative sign denotes decrease

Thus the product has decreased by 80 %

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2 years ago