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MATH SOLVE
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Alba worked for 6 hr 45 min at $7.90 per hour. What numbers could she use to estimate how much money she earned? Estimate the amount she earned, and the state whether you think the exact amount is a little more or a little less than your estimate.
General
4 months ago
Aliaa is skating down a ramp. The wheels on her skateboard have diameters of 60 \text{ mm}60 mm60, start a text, space, m, m, end text.What is the distance Aliaa travels when her skateboard wheels make 202020 revolutions
General
4 months ago
6. Protein bars come in a 4-pack box or 12-packbox. The 4-pack costs $7.68 and the 12-packcosts $22.32. Which box is the better value
General
4 months ago
Ellen has a gift card to Target for $50. She didn’t want to go over the $50 and be embarrassed having to put back items, so she kept a running total estimate in her head while she shopped. In her cart, she had a sweater for $15.99, a pop socket for $9.99, a DVD for $7.99, and a new book by her favorite author for $12.99. (Note: tax is 5.5% where Ellen lives). She estimated 47 before tax. Ellen was shocked when the cashier told her that the total was $55.54. Who did something wrong? Did Ellen round incorrectly somewhere, or did the cashier punch something wrong into the cash register? Show your work and describe how you arrived at your answer.
General
4 months ago
What is the equation in slope-intercept form of the line graphed below?
General
4 months ago
15 is what percentage of 30
General
4 months ago
Two dice are rolled. Let X = 1 if the dice come up doubles and let X = 0 otherwise. Let Y = 1 if the sum is 6, and let Y = 0 otherwise. Let Z = 1 if the dice come up both doubles and with a sum of 6 (that is, double 3), and let Z = 0 otherwise. Let pX denote the success probability for X. Find pX. Let pY denote the success probability for Y. Find pY. Let pZ denote the success probability for Z. Find pZ. Are X and Y independent? Does pZ = pXpY? Does Z = XY? Explain.
General
4 months ago
A lucky customer at "Used Car Charlie's Lot" will get to randomly select one key from a barrel of keys. The barrel contains the keys to all of the cars on Charlie's lot. The inventory lists 80 cars, of which: 38 are foreign models 50 compact models 22 foreign compact models What is the probability that the lucky customer will win a nonforeign compact car?
General
4 months ago
Given the third-order differential equation z′′′+2z′′−4z′−8z=0, find the general solution. Enter your solution as z(x)=... . In your answer, use c1 and c2 to denote arbitrary constants and x the independent variable. Enter c1 as c1, c2 as c2 and c3 as c3.
General
4 months ago
The probability density function of X , the lifetime of a certain type of electronic device (measured in hours), is given by f ( x ) = { 10 x 2 x > 10 0 x ≤ 10 Find P { X > 20 } . What is the cumulative distribution function of X ? What is the probability that of 6 such types of devices, at least 3 will function for at least 15 hours? What assumptions are you making?
General
4 months ago
Rachel earned $34 in 4 hours at her job today. She wants to know how much she could earn tomorrow if she works 10 hours at the same hourly rate.
General
5 months ago
In triangle JKL, If angle L is thirteen more than angle K and angle J is seven times more than six times angle K, find the measure of each angle.
General
5 months ago
The formula for the sum of an infinite geometric series, s=a1/1-r, may be used to convert 0.23 to a fraction. What are the values of a1 and r?
General
5 months ago
Pennies used to be made of copper and zinc and had a mass of 3.1g today pennies are made of copper plated zinc and have a mass of 2.5 G. A new pennies mass is what percent of an old pennies mass?
General
5 months ago
Andrea put 2 quarts of water and 1 cup of lemon juice in a pitcher how many total cup of liquid are in the pitcher
General
5 months ago
Solve the system of equations using any method. 6x + 4y = −8 4x − 2y = 2
General
5 months ago
Algebra questions^^^^^^
General
5 months ago
A company offered one half of its employees a bonus if the production of gears increased by 50%. The other half of the employees was not offered a bonus. As the end of the month, production in the group that did not get the bonus offer increased by a mean of 20 and production in the bonus group increased by a mean of 40. What is the correct order of steps to determine if the results are significant? A. Calculate the probability of a difference of 20. B. Randomly separate the employees’ individual results into two groups. C. Calculate the mean of each group. D. Calculate the difference of the means. E. Run the experiment many times.
General
5 months ago
A plumber charges $25 to come to a home, and $50 per hour for a repair. Which equation gives the total cost, y, for a repair that lasts x hoursa) 15x-25=yb) 15x+25=yc) 25x-15=yd) 25x+15=y
General
5 months ago
Yoku Is putting on sunscreen. He uses 2 ml to cover 50 cm² of his skin. He wants to know how many milliliters of sunscreen he needs to cover 325 cm² of the skin.
General
5 months ago
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