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Elena-2011 [213]
3 years ago
8

Solve -4a² - 1/5b + 1/7cif a = 3, b = -5, c = -21​

Mathematics
1 answer:
frutty [35]3 years ago
8 0

Answer:

Step-by-step explanation:

-4(3)² - 1/5(-5) + 1/7(-21)

-4(9) + 1 - 3

-36 + 1 - 3

-35 - 3 = -38

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Write the fractional equivalent (in reduced form) of each number.
ladessa [460]

Answer:

1) 1/10

2)16/100

3)6..../10

4) 3/5

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Step-by-step explanation:

8 0
3 years ago
Rico bicycles on average speed of 12.5 miles per hour what distance will Rico bicycle are in 5.5 hours
aleksley [76]

Answer:

68.75 miles

Step-by-step explanation:

12.5 x 5.5 is 68.75

Hope this helped!

5 0
3 years ago
What equation represents y=2x^2+24x+85 in vertex form
Andrej [43]
Y=a(x-h)^2+k

vertex form is basically completing the square

what you do is
for
y=ax^2+bx+c
1. isolate x terms
y=(ax^2+bx)+c
undistribute a
y=a(x^2+(b/a)x)+c
complete the square by take 1/2 of b/a and squaring it then adding negative and postive inside
y=a(x^2+(b/a)x+(b^2)/(4a^2)-(b^2)/(4a^2))+c
complete square
too messy \
anyway

y=2x^2+24x+85
isolate
y=(2x^2+24x)+85
undistribute
y=2(x^2+12x)+85
1/2 of 12 is 6, 6^2=36
add neagtive and postivie isnde
y=2(x^2+12x+36-36)+85
complete perfect square
y=2((x+6)^2-36)+85
distribute
y=2(x+6)^2-72+85
y=2(x+6)^2+13

vertex form is
y=2(x+6)^2+13
8 0
3 years ago
Write the equation. Lucy rides her bike 20 kilometers every week. How many kilometers does Lucy ride her bike in 7 weeks
Irina18 [472]

Answer:

140 kilometers in 7 weeks

Step-by-step explanation:

20 km x 7= 140 km

3 0
3 years ago
How many hours are there in ten quarters of an hour?
svlad2 [7]

Answer:

2 1/2 hours

Step-by-step explanation:quarters means 1/4 and there are 4 of them in each hours  so if you have 10 quarters of a hour they add up to 2 hours and a half, because 2 hours times 4 equals 8 quarters and then add the other 2 quarters and you get half

6 0
3 years ago
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