Answer:
x² + 4x - 21
Step-by-step explanation:
Given the solutions of x = 3 and x = -7, moving the constant to the other side and setting both equations equal to '0':
x - 3 = 0 and x + 7 = 0
So, the two binomials that make up the quadratic are:
(x - 3)(x + 7)
Use FOIL: x² + 7x - 3x - 21
Combine like terms: x² + 4x - 21
Answer:
44.1
Step-by-step explanation:
Pls brainiest
9*4.2=first rectangle area=37.8
3*4.2/2=small triangle=3*2.1=6.3
37.8+6.3=44.1
Answer:
c. 108.4
Step-by-step explanation:
cos theta = (u dot v)/ (||u|| ||v||)
where dot stands for dot product and || || is the magnitude
u = (1,5) v= (7,-4)
u dot v = (1*7 + 5*-4) = 7-20 = -13
||u|| = sqrt( 1^2 +5^2) = sqrt(1+25) = sqrt(26)
||v|| = sqrt(7^2 + (-4)^2) = sqrt(49+16) = sqrt(65)
cos theta = -13/ sqrt(26) sqrt(65)
cos theta = -13 /sqrt(1690)
theta = arccos (-13/sqrt(1690))
theta = 108.43
Answer:
the book has 64 pages
Step-by-step explanation:
denoting the number of pages of the book as X then
number of pages read on Monday + number of pages read on Tuesday + number of pages read on Wednesday = number of pages of the book
40 + 1/8*X + 1/4*X = X
40 + 3/8*X = X
40 = X - 3/8*X = 5/8*X
X = 40*8/5 = 64 pages
therefore the book has 64 pages
In 2021 a 13 year old will be 17 years old.