Ask question

Ask question

All categories

4 years ago

11

last week, Jim worked h hours and earned $9 per hour. if he earned a total of $405, which equation can be used to find out how m

any hours Jim worked.

1 answer:

ad-work [718]4 years ago

8 0

I hope this helps you

if he can earn $9 per hour

$405 ? hours

?=405/9

?=45 hours he worked

You might be interested in

A rectangle has the length of 22 inches less than 7 times the width. If the area of the rectangle is 3197 square inches, find th

Nikolay [14]

The length of rectangle is 139 inches

Solution:

Given that, area of the rectangle is 3197 square inches

Let "L" be the length of rectangle and "W" be the width of rectangle

Also given that rectangle has the length of 22 inches less than 7 times the width

Length = 7 times width - 22

L = 7W - 22

<em><u>The area of rectangle is given as:</u></em>

$\text {Area of rectangle }=\text { length } \times \text { width }$

Substituting the values we get,

$\begin{array}{l}{3197=(7 W-22)(W)} \\\\ {3197=7 W^{2}-22 W} \\\\ {7 W^{2}-22 W-3197=0}\end{array}$

On solving the above quadratic equation using quadratic formula,

$\text {For the quadratic equation } a x^{2}+b x+c=0 \text { where } a \neq 0$

$x=\frac{-b \pm \sqrt{\left(b^{2}-4 a c\right)}}{2 a}$

$\begin{array}{l}{\text {Here in } 7 \mathrm{W}^{2}-22 \mathrm{W}-3197=0} \\\\ {a=7 ; b=-22 ; c=-3197}\end{array}$

Substituting in above quadratic formula,

$\begin{array}{l}{W=\frac{-(-22) \pm \sqrt{\left((-22)^{2}-4(7)(-3197)\right)}}{2 \times 7}} \\\\ {W=\frac{22 \pm \sqrt{90000}}{14}=\frac{22 \pm 300}{14}} \\\\ {W=\frac{22+300}{14} \text { or } W=\frac{22-300}{14}} \\\\ {W=23 \text { or } W=-19.85}\end{array}$

Since width of rectangle cannot be negative, ignore negative value of "W"

So width W = 23 inches

Length L = 7W - 22 = 7(23) - 22 = 139 inches

Thus length of rectangle is 139 inches

8 0

4 years ago

10u^2 - 4u + 3 for u = 7

Alika [10]

Answer:

L(x)=136x−487

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Quick!!!!!!!!!!!!!!!

Degger [83]

Answer: discrete.

Step-by-step explanation:

Discrete variable

It is a variable whose value is evaluated by counting.

Example: Number of books published in a month.

Continuous variable

It is a variable whose value is evaluated by measuring ( not countable).

Example: Distance: 1.52 m

Since the number of dental visits a randomly chosen person had for the past 5 years is a countable.

here, Variable: Let X =number of dental visits a randomly chosen person had for the past 5 years

So, the random variable described is discrete.

7 0

3 years ago

the sign is programmed to blink using absolute value inequalities of the form |x-a|≤b and |x-a|≥b Which of these formulas is use

horrorfan [7]

Answer:

a = 20, b = 5

Step-by-step explanation:

| x-a| ≥ b

| x - 20 | ≥ 5

a = 20 ... car speed

b = 5 ... either 5 m/h above or lower than the limit speed 20 m/h

6 0

3 years ago

Cosystem apnica

STatiana [176]

Ok line y because you have to plot two right

3 0

4 years ago