It's 90° because Z has to be 45
Answer:
Step-by-step explanation:
first the formula for frequency is f=1/t
some then the answer is f= 1/40
f= 0.025
Answer:
DP = 9/5
Step-by-step explanation:
DP + PE = DE
DP: x
PE: 4x + 7
DE: 10x - 2
x + 4x + 7 = 10x - 2
5x + 7 = 10x - 2
-5x = -9
x = 9/5
DP: 9/5
PE: 4(9/5) + 7
DE: 10(9/5) - 2
Check:
9/5 + 4(9/5) + 7 = 10(9/5) - 2
1.8 + 7.2 + 7 = 18 - 2
16 = 16
Answer:
158 students cannot play an instrument
Step-by-step explanation:
x/200=79/100
79*200=15800
15800/100=158
158/200=0.79 or 79%