Tutors Answer Your Questions about Linear Algebra (FREE)
Question 45866: the element europium (EU) exists in nature as two isotopes: (151 EU)with a mass of 150.9196 amu & (153 EU) with a mass of 152.9209 amu. The average mass of EU is 151.96 How do you calculate the relative abundance of the two EU isotopes? X% times 150.9196 (plus) Y% times 152.9209 equals = 151.96. what are the X and Y percentages? And what is the formula to identify the unknowns X and Y?
Click here to see answer by stanbon(75887)  |
Question 46996: 1. When 3+4i / 2+i is expressed in the for a+bi, what is the value of a?
I don't understand why the answer is 2.
2. (i+1)(3-i)+(2i-1)
I tried multiplying the first two sets and adding the like terms with the third set but I'm not coming up with the correct answer.
Click here to see answer by mathchemprofessor(65) |
Question 47158: A right triangle is a triangle with one angle measuring 90°. In a right triangle, the sides are related by Pythagorean Theorem,c^2=a^2+b^2 , where c is the hypotenuse (the side opposite the 90° angle). Find the hypotenuse when the other 2 sides’ measurements are 6 feet and 8 feet.
Click here to see answer by adamchapman(301) |
Question 47158: A right triangle is a triangle with one angle measuring 90°. In a right triangle, the sides are related by Pythagorean Theorem,c^2=a^2+b^2 , where c is the hypotenuse (the side opposite the 90° angle). Find the hypotenuse when the other 2 sides’ measurements are 6 feet and 8 feet.
Click here to see answer by Nate(3500) |
Question 49102: consitstent and inconsistnt systems
1.find the slope and y intercept of each line
give the number of solutions
x+y=5
y=2x+2
slope 1=0 and b 1=5
slope 2=2 and b 2=2
is that correct or please help i know im doing something wrong can the slope be a -1 for the first or would -x be 0
Click here to see answer by checkley71(8403) |
Question 50335: I can not figure out how to exactly put this problem into an Linear equation, basically because i don't know where the numbers fit into the equation. So here is the problem.
The number of married couples in the United States in 1995 was 53.9 million. Im 2000, the number of married couples grew to 55.3 million. Write a linear equation that gives the number of married couples in terms of the year. Let x represent the year with x=5 corresponding to 1995.
Click here to see answer by stanbon(75887) |
Question 50335: I can not figure out how to exactly put this problem into an Linear equation, basically because i don't know where the numbers fit into the equation. So here is the problem.
The number of married couples in the United States in 1995 was 53.9 million. Im 2000, the number of married couples grew to 55.3 million. Write a linear equation that gives the number of married couples in terms of the year. Let x represent the year with x=5 corresponding to 1995.
Click here to see answer by tutorcecilia(2152)  |
Question 50309: hello, thanks for this wonderful site.
could you please help me to solve those problems in page 506, any even number, and please be very specific in your answer, step by step
sorry to bother you
again thanks
bye
Click here to see answer by rapaljer(4671)  |
Question 50521: I need your help on this. Please help me understand this better.
1
Instructions: Graph each pair of equations in the same coordinate plane. Find the coordinates of the point where the graphs intersect. Then show by substitution that the coordinates satisfy both equations.
3x+2y=0
x-2y=8
Click here to see answer by tutorcecilia(2152) |
Question 50781: The work principal states that if one person can do a job in time 'a' and another can do the same job in time 'b' that they can do the job together in time 't'. This is demonstrated by the equation:
1 over a plus 1 over b = 1 over t
Write the expression in terms of a:
And then use t=5 hours and b=8 hours, approximately what is a?
Click here to see answer by checkley71(8403) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760
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