Answer:
Step-by-step explanation:
x^2 + 3x - 9 =0
By comparing with the equation ax^2+bx+c = 0,
we get,
a = 1, b=3, c = -9
we know the formula for x is,
x = (-b±√(b^2 - 4ac))/2a
x = (-3±√45)/2
x = (-3±3√5)/2
x = (-3+3√5)/2, (-3-3√5)/2
Answer:
22 millilitres of 13% solution
23 millilitres of 19% solution
Step-by-step explanation:
A + B = 45
13A + 19B = 45 x 17 = 765
-13A - 13B + 13A + 19B = -650 + 765 = 115
5B = 115
B = 23
22 + 23 = 45
A = 22
Answer:
4 campers per table
Step-by-step explanation:
There are 6 campers per table, you need 4 campers per table to seat 24 campers in total.
6 x 4 = 24
Answer:
359 + r = 212
Step-by-step explanation:
"359 and r more" suggests that you are adding the number 359 with the variable r. r + 359
"equals 212" is "= 212"
Put the two together:
359 + r = 212 is your answer.
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