Mathematics

Mathematics, 29.07.2019 10:20, tonya3498

Find the unknown value of 54 is 75% of ?

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Could someone me with my algebra expressions homework? three more than twice an unknown number of dollars 8 divided by an unknown number of cartoons 4 times an unknown number of persons decreased by 8 8 less than the sum of an unknown number of students and three an unknown number of test items deminished by four 6 times the sum of an unknown number of computers and 3 one third of an unknown number of books increased by 8 the difference of an unknown number of records and 3 divided by 8 one-fourth of an unknown number of teachers tripled the product of 3 and the sum of 8 and an unknown number of fish an unknown number of tickets divided by 8 3 increased by the difference of an unknown number of coins and eight

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Potassium standards gave the following emission intensities at 404.3 nm. emission from the unknown was 417. find the [k+] and its uncertainty in the unknown. (use a spreadsheet / graphing program to make a concentration vs. emission signal plot, then find the [k+] and its uncertainty in the unknown.) sample (µg k/ml) relative emission blank 0 5.00 124 10.00 243 20.0 486 30.0 712 unknown 417

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Chemistry, 10.10.2019 05:00, shyah90

Here are mass spectrometric signals for methane in h2. ch4 (vol %): 0 0.062 0.122 0.245 0.486 0.971 1.921 signal (mv): 9.1 47.5 95.6 193.8 387.5 812.5 1671.9 (a) subtract the blank value (9.1) from all other values. then use the method of least squares to find the slope and intercept and their uncertainties. slope intercept * construct a calibration curve. (do this on paper. your instructor may ask you to turn in this work.) (b) replicate measurements of an unknown gave 152.1, 154.9, 153.9, and 153.6 mv, and a blank gave 9.5, 9.4, 10.6, and 8.4 mv. subtract the average blank from the average unknown to find the average corrected signal for the unknown. (c) find the concentration of the unknown and its uncertainty. vol%

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