Let u with rightwards arrow on top equals open angle brackets fraction numerator square root of 2 over denominator 2 end fraction comma fraction numerator square root of 2 over denominator 2 end fraction close angle brackets. Which of the following is true? D subscript u with rightwards arrow on top end subscript f (4 comma 4 )greater than 0 D subscript u with rightwards arrow on top end subscript f (4 comma 4 )less than 0 D subscript u with rightwards arrow on top end subscript f (4 comma 4 )equals 0

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

a. she will receive a refund of $278.

step-by-step explanation:

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.