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3 years ago

HELPPP MY MATH HOMEWORK!!!

Mathematics

2 answers:

11Alexandr11 [23.1K]3 years ago

7 0

D and then A I would say

statuscvo [17]3 years ago

7 0

I dont know how to answer number 12 but number 13 is the first one 3x + 15 = 17

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Find the markup and the selling price of the following item. Round answers to the nearest cent. A chemistry set costing $38.50,

pochemuha

In order to compute the markup, compute the percentage like this:
$38.50\times0. 32=12,32$
The markup is then $12,32.
The selling price is the sum of the cost and the markup:
$38.50+12,32=50,82$

3 0

4 years ago

Can someone please help me it’s due in 5 minutes

Thepotemich [5.8K]

Answer:

You can use Desmos to graph any equation:

4 0

3 years ago

Suppose that a student has saved all answers of his or her first attempt for a homework assignment in this course and has 80% co

kogti [31]

Answer:

zero

Step-by-step explanation:

submission was don 1 second late and based on the university policy, no excuse is accepted for late submission)

Late submissions are not marked,

8 0

4 years ago

Julie and Eric row their boat (at a constant speed) 18 miles downstream for 3 hours helped by the current. Rowing at the same ra

Nastasia [14]

Answer

Find out the the rate of the boat in still water.

To proof

let us assume that the speed of the boat in the still water = u

let us assume that the speed of the current = v

Formula

$speed = \frac{Distance}{time}$

As given

18 miles downstream for 3 hours

Now for the downstream

$u + v = \frac{18}{3}$

u + v = 6

now for the upstream

As given

the trip back against the current takes 6 hours

$u - v = \frac{18}{6}$

u-v = 3

Than the two equation becomes

u + v = 6 and u - v = 3

add both the above equation

we get

2u = 9

u = 4.5miles per hour

put this in the u - v = 3

4.5 -v = 3

v =1.5 miles per hour

The rate of the boat in the still water is 4.5miles per hour .

Hence proved

3 0

3 years ago

Solve the equation uding the most direct method: 3x(x+6)=-10?

Tanzania [10]

To solve this problem, you will use the distributive property to create an equation that can be rearranged and solved using the quadratic formula.

<h3>Distribute</h3>

Use the distributive property to distribute 3x into the term (x + 6):

$3x(x+6)=-10$

$3x^2+18x=-10$

<h3>Rearrange</h3>

To create a quadratic equation, add 10 to both sides of the equation:

$3x^2+18x+10=-10+10$

$3x^2+18x+10=0$

<h3>Use the Quadratic Formula</h3>

The quadratic formula is defined as:

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

The model of a quadratic equation is defined as ax² + bx + c = 0. This can be related to our equation.

Therefore:

a = 3
b = 18
c = 10

Set up the quadratic formula:

$\displaystyle x=\frac{-18 \pm \sqrt{(18)^2 - 4(3)(10)}}{2(3)}$

Simplify by using BPEMDAS, which is an acronym for the order of operations:

Brackets

Parentheses

Exponents

Multiplication

Division

Addition

Subtraction

Use BPEMDAS:

$\displaystyle x=\frac{-18 \pm \sqrt{324 - 120}}{6}$

Simplify the radicand:

$\displaystyle x=\frac{-18 \pm \sqrt{204}}{6}$

Create a factor tree for 204:

204 - 1, 2, 3, 4, 6, 12, 17, 34, 51, 68, 102 and 204.

The largest factor group that creates a perfect square is 4 × 51. Therefore, turn 204 into 4 × 51:

$\sqrt{4\times51}$

Then, using the Product Property of Square Roots, break this into two radicands:

$\sqrt{4} \times \sqrt{51}$

Since 4 is a perfect square, it can be evaluated:

$2 \times \sqrt{51}$

To simplify further for easier reading, remove the multiplication symbol:

$2\sqrt{51}$

Then, substitute for the quadratic formula:

$\displaystyle x=\frac{-18 \pm 2\sqrt{51}}{6}$

This gives us a combined root, which we should separate to make things easier on ourselves.

<h3>Separate the Roots</h3>

Separate the roots at the plus-minus symbol:

$\displaystyle x=\frac{-18 + 2\sqrt{51}}{6}$

$\displaystyle x=\frac{-18 - 2\sqrt{51}}{6}$

Then, simplify the numerator of the roots by factoring 2 out:

$\displaystyle x=\frac{2(-9 + \sqrt{51})}{6}$

$\displaystyle x=\frac{2(-9 - \sqrt{51})}{6}$

Then, simplify the fraction by reducing 2/6 to 1/3:

$\boxed{\displaystyle x=\frac{-9 + \sqrt{51}}{3}}$

$\boxed{\displaystyle x=\frac{-9 - \sqrt{51}}{3}}$

The final answer to this problem is:

$\displaystyle x=\frac{-9 + \sqrt{51}}{3}$

$\displaystyle x=\frac{-9 - \sqrt{51}}{3}$

3 0

2 years ago