Answer:
$120
Step-by-step explanation:
40% off means that the post reduction price is 60% of the original.
Therefore, if $45 is 60% of the original,
100% of the original price = 45 / 60 x 100 = $75
Therefore, the total cost of both = 45 + 75 = 120
Answer:
x = 6
Step-by-step explanation:
Take f(x) = -(x+9)(x-21) and multiply it out. We get:
f(x) = -[x^2 + 9x - 21x - 189], or
f(x) = -x^2 + 12x + 189
This is a quadratic equation. The coefficients are a = -1, b = 12 and c = 189.
The equation of the axis of symmetry is x = -b/(2a), which here equals:
x = -12 / [2*(-1)], or x = 6.
You need to find 85% of 60.
85% means 0.85 .
"of" means "times" .
(0.85) times (60 questions) = <em>51 questions</em>
Step-by-step explanation:
Area of rectangle =height×base
4 1/2×3 3/7=9/2×24/7=216/14=15 6/14=15 3/7
Answer:
u=2/2a-1
Step-by-step explanation:
a=1/u +1/2
you find the LCM first which is 2u
a=2+u/2u
cross multiply
2au=2+u
subtract u from both sides
2au-u=2
u is common to the right hand side
u(2a-1)=2
divide through by 2a-1
u=2/2a-1
