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3 years ago

(2 ÷ 12) - 32 + 4 × 8 - 33

Mathematics

2 answers:

Citrus2011 [14]3 years ago

7 0

Answer:

222.92

Step-by-step explanation:

(2 ÷ 12) - 32 + 4 × 8 - 33

ok lets simplify

0.1666 rounds up to 0.17

0.17 ÷ 12 = 0.01 (rounded up)

0.01 -32 = 31.99

31.99 + 4 = 35.99

35.99 x8 =255.92

255.92 - 33 = 222.92

WARNING: MIGHT BE INCORRECT OR OFF SLIGHTLY!

valkas [14]3 years ago

6 0

ANSWER

$- \frac{197}{8}$

EXPLANATION

The given expression is

$(2 \div 12) - 32 + 4 \times 8 - 33$

We simplify the parenthesis first to obtain:

$\frac{1}{6} - 32 + 4 \times 8 - 33$

We now multiply to get,

$\frac{1}{6} - 32 + 32- 33$

Next, we add to get;

$\frac{1}{6} - 33$

We finally subtract by collecting LCD.

$\frac{1 - 198}{6} = - \frac{197}{6}$

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A piece of cardboard has the dimensions (x + 15) inches by (x) inches with the area of 60 in 2 . Write the quadratic equation th

pochemuha

Answer:

$x^2 + 15x - 60 = 0$

The actual dimension is 18.28 by 3.28

Step-by-step explanation:

Given

Dimension:

$(x + 15)\ by\ x$

$Area = 60in^2$

Required

Determine the quadratic equation and get the possible values of x

Solving (a): Quadratic Equation.

The cardboard is rectangular in shape.

Hence, Area is calculated as thus:

$Area = Length * Width$

$60= (x + 15) * x$

Open Bracket

$60= x^2 + 15x$

Subtract 60 from both sides

$x^2 + 15x - 60 = 0$

Hence, the above represents the quadratic equation

Solving (b): The actual dimension

First, we need to solve for x

This can be solved using quadratic formula:

$x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

Where

$a = 1$

$b = 15$

$c = -60$

So:

$x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

$x = \frac{-15 \± \sqrt{15^2 - 4*1*-60}}{2*1}$

$x = \frac{-15 \± \sqrt{225 + 240}}{2}$

$x = \frac{-15 \± \sqrt{465}}{2}$

$x = \frac{-15 \± \21.56}{2}$

Split:

$x = \frac{-15 + 21.56}{2}$ or $x = \frac{-15 - 21.56}{2}$

$x = \frac{6.56}{2}$ or $x = \frac{-36.36}{2}$

$x = 3.28$ or $x = -18.18$

But length can't be negative;

So:

$x = 3.28$

The actual dimensions: $(x + 15)\ by\ x$ is

$Length =3.28 +15$

$Length =18.28$

$Width = x$

$Width =3.28$

The actual dimension is 18.28 by 3.28

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