3 years ago

Can you please help me!

Mathematics

1 answer:

Burka [1]3 years ago

7 0

Answer:

x=20

Step-by-step explanation:

3x - 10 + 5x + 30 = 180

8x + 20 = 180

8x = 160

x = 160/8

x = 20

check:

3(20) - 10 + 5(20) + 30 = 180

60 - 10 + 100 + 30 = 180

50 + 100 + 30 = 180

150 + 30 = 180

180 = 180 ✓

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Is 4/5 greater or less than 6/7

Stolb23 [73]

Answer:

4/5 < 6/7

Step-by-step explanation:

first we need to equalize the denominator so we can compare them

4/5 Ο 6/7

28/35 Ο 30/35

28/35 < 30/35

4/5 < 6/7

7 0

3 years ago

Help on #97! Need to know how to work it out using polynomial equations!

olganol [36]

Area = length * width
length = (2 * width) - 1
$10 = l*w\\ 10=(2w-1)*w\\ 10=2w^{2}-w\\ 2w^{2}-w-10=0\\ (2w-5)(w+2)=0\\\\ 2w-5=0\\ 2w=5\\ w=\frac{5}{2}=2.5\\ w+2=0\\ w=-2$
Since length cannot be negative, w = -2 is not a solution. Thus, $\frac{5}{2}~ft$ is your width.
Since length = 2 * width - 1, plug in width:
$l=2(\frac{5}{2})-1\\ l=5-1\\ l=4~ft$