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3 years ago

Help me please !!!!!!!!

Mathematics

1 answer:

Mademuasel [1]3 years ago

6 0

Line up corresponding parts of the similar triangle to make ratios.
You need 3 parts of the 6, including one complete fraction.
Next cross-multiply to solve for the missing sides.

# 15
a/x = b/y = c/z
6/10 = 8/y
cross-multiply
6y = 8*10
6y = 80
divide both sides by 6
y = 13 1/3 or 40/3
CHECK
6/10 ??=?? 8/ (13 1/3)
.6 = .6 CHECKS

# 16
4/7 = c/5
cross-multiply
7c = 4 * 5
7c = 20
divide both sides by 7
c = 20/7
CHECK
4/7 ??=?? (20/7)/5
.5714 = .5714 CHECKS

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3 years ago

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KATRIN_1 [288]

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3 years ago

A "child has six blocks, three of which are red and three of which are green". How many patterns can shemake by placing them all

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Answer: There are 20 ways and 1680 ways respectively.

Step-by-step explanation:

Since we have given that

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So, Number of patterns she can make by placing them all in a line is given by

$\dfrac{6!}{3!\times 3!}\\\\=20$

If there are 3 white blocks

so, total number of white blocks becomes 9

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$\dfrac{9!}{3!\times 3!\times 3!}\\\\=1680\ ways$

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3 years ago

This is 2.

Jlenok [28]

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3 years ago

James is kayaking. He can row 3 mph in still water. If he can travel 6 miles downstream in the same amount of time that he can t

nekit [7.7K]

Answer: the speed of the current is 0.6 mph

Step-by-step explanation:

Let x represent the speed of the current.

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Time = distance/speed

Time taken to travel downstream is

6/(3 + x)

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4/(3 - x)

Since the time is the same, then

6/(3 + x) = 4/(3 - x)

Cross multiplying, it becomes

6(3 - x) = 4(3 + x)

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4x + 6x = 18 - 12

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x = 6/10

x = 0.6 mph

4 0

3 years ago