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4

Step-by-step explanation:

90 is 70% of x.

90 = 70% × x

90 = 70/100x

Divide both sides by x.

90/x = 70/100

4

Step-by-step explanation:

Because %s can be expressed as fractions over 100, because 90 is 70% of x, 70% is 70% of 100.  Thus, 90/x = 70/100.

Hope it helps <3

4 dots on 0. 9 dots on 1. 8 dots on 2. 5 dots on 3. 5 dots on 4. 3 dots on 5. 2 dots on 6. 2 dots on 7.

Step-by-step explanation: