$y = 2 \cos(4x) - 1 \\ when \: y = 0 \\ \cos(4x) = \frac{1}{2} \\ 4x = 60 \\ x = 15 \\ when \: x = 0 \\ y = 2 - 1 = 1 \\ intercepts = > (15, \: 0) \: and \: (0, \: 1) \\ midpoints : ( \frac{15 + 0}{2} , \: \frac{0 + 1}{2} ) \\ = (7.5, \: 0.5) \\ gradient = \frac{1 - 0}{0 - 15} \\ = - \frac{1}{15} \\ y = mx + c \\ at \: (7.5, \: 0.5) \\ 0.5 = - \frac{1}{15} \times 7.5 + c \\ 0.5 = - 0.5 + c \\ c = 1 \\ \therefore \: y = - \frac{1}{15} x + 1 \\ = > 15y = - x + 15$

6 0

3 years ago

6t-8=2(2t+1) please help

JulijaS [17]

Answer:

t=5

Step-by-step explanation:

you can also use mathpapa it's a calculator that gives you the answer and solves it for you step by step.

7 0

3 years ago

Read 2 more answers

This is very hard teacher didn't teach us yet

77julia77 [94]

Answer:

0.45

Step-by-step explanation:

Percentages are the number over 100 which is basically 45/100. This fraction can be converted into a decimal, as the decimal places are 0.(tenths 1/10)(hundredths 1/100). 45 going into the hundredths puts the 4 in the tenths and the 5 in the hundredths.

7 0

3 years ago