Find the surface area of the regular pyramid shown to the nearest whole number
1 answer:
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Use the distributive property to multiply 1/5 by 4-3x.
Multiply 1/5 and 4 to get 4/5.
Multiply 1/5 and -3 to get -3/5.
Use the distributive property to multiply 1/7 by 3x-4.
Multiply 1/7 and 3 to get 3/7 & 1/7 × -4 to get -4/7.
Subtract from both sides.
Combine and
to get
.
Subtract 4/5 from both sides.
The least common multiple of 7 and 5 is 35. Convert -4/7 and 4/5 to fractions with denominator 35.
Because and
have the same denominator, subtract them by subtracting their numerators.
Subtract 28 from -20 to get -48.
Multiply both sides by , the reciprocal of
.
Multiply by
by multiplying the numerator by the numerator and the denominator by the denominator.
Carry out the multiplications in the fraction .
Reduce the fraction 1680/1260 to its lowest terms by extracting and cancelling out 420.