Ef=19, as given in the question.
Answer:
52 62 72 82 92 102 112 120 121 122 123 124 125 126 127 128 129 132 142
there are 19.
Step-by-step explanation:
2d + 13 = 12
d = -0.5
-0.5 × 2 = -1
13 + (-1) = 12
Hope this helped☺☺
Explanations:
Twice a number d and 13 = 2d + 13
The sum = Total
Is 12 = "= 12"
That equals :
2d + 13 = 12
Answer:
x =(8-√176)/8=1-1/2√ 11 = -0.658
Step-by-step explanation:
Answer:
x = 7
y = 2
Step-by-step explanation:
x² - y² = 45
(x+y) (x-y) = 45
x + y = 9 (known)
9 x (x-y) = 45
x - y = 5
y = x-5
x + (x - 5) = 9 (substitute)
2x = 14
x = 7
y = 2
