What is 9×9+8-8÷10Please And Thank You

Mathematics

2 answers:

BartSMP [9]3 years ago

4 0

Order of operations

PEMDAS

There are no parenthesis

There are no exponents

Now, we do multiplication and division from left to right

(9x9) + 8 - (8/10)

81 + 8 - 0.8

Now, we do addition and subtraction from left to right

(81 + 8) - 0.8

89 - 0.8

88.2

Natalija [7]3 years ago

3 0

9x9=81

8/10=0.8

81+8-0.8=89-0.8=88.2

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Chau is riding on a bike course that is 80 miles long. So far, he has ridden 64 miles of the course. What percentage of the cour

skelet666 [1.2K]

Let the percentage be x%,

then,

x% of 80 = 64
$\frac{x}{100} \times 80 = 64 \\ \frac{x}{10} \times 8 = 64 \\ \frac{x}{10} = \frac{64}{8} \\ x = 8 \times 10 = 80 \%$

He has ridden 80% of the total bike course.

!! Hope It Helps !!

6 0

3 years ago

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notsponge [240]

Option 3

The solution for given expression is $\frac{(x - 4)(x - 4)}{(x + 3)(x + 1)}$

<h3><u>Solution:</u></h3>

Given that we have to divide,

$\frac{x^2 -16}{x^2 + 5x + 6} \div \frac{x^2 + 5x + 4}{x^2 -2x - 8}$ ---- (A)

Let us first factorize each term and then solve the sum

Using $a^2 - b^2 = (a + b)(a - b)$

$x^2 -16 = x^2 - 4^2 = (x + 4)(x -4)$ ----- (1)

$x^2 + 5x + 6 = (x + 2)(x + 3)$ ----- (2)

$x^2 + 5x + 4 = (x+1)(x + 4)$ ---- (3)

$x^2 -2x - 8 = (x-4)(x + 2)$ ---- (4)

Now substituting (1), (2), (3), (4) in (A) we get,

$\frac{(x + 4)(x -4)}{(x +2)(x +3)} \div \frac{(x+1)(x+4)}{(x-4)(x +2)}$

To do division with fractions, we turn the second fraction upside down and change the division symbol to a multiplication symbol at the same time. Then we treat this as a multiplication problem, by multiplying the numerators and the denominators separately.

$\frac{(x + 4)(x -4)}{(x +2)(x +3)} \times \frac{(x - 4)(x + 2)}{(x + 1)(x + 4)}$